mirror of
https://github.com/namibia/awesome-cheatsheets.git
synced 2024-12-22 01:58:54 +00:00
Merge pull request #391 from Philip-Walsh/master
fix spelling and whitespace in cheatsheets
This commit is contained in:
Julien Le Coupanec
GitHub
commit
88e5be6e4b
@ -3,7 +3,7 @@ CHEATSHEET C#
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1. Data Types
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Primitive Size Example
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String 2 bytes/char s = "reference";
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bool b = true;
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char 2 bytes ch = 'a';
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@ -16,20 +16,20 @@ CHEATSHEET C#
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decimal 16 bytes val = 70.0M;
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2. Arrays
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2.1 Declaration
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//Initiliazed using a list defined with curly braces
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int[] nameArray = {100, 101, 102};
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//Define an empty array
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int[] nameArray = new int[3]; // 3 rows and 2 columns
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//To access a specific item in the array
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int[] nameArray = new int[10];
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int firstNumber = nameArray[0];
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nameArray[1] = 20;
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//Multidimensional arrays
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int [,] matrix = new int [2,2]
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matrix[0,0] = 1;
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@ -40,26 +40,26 @@ CHEATSHEET C#
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int[,] predefinedMatrix = new int[2,2] { { 1, 2 }, { 3, 4 } };
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2.2 Array Operations
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//Sort ascending
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Array.Sort(nameArray);
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//Sort begins at element 6 and sorts 20 elements
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Array.Sort(nameArray,6,20);
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//Use 1 array as a key & sort 2 arrays
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string[] values = {"Juan", "Victor", "Elena"};
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string[] keys = {"Jimenez", "Martin", "Ortiz"};
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Array.Sort(keys, values);
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//Clear elements in array (array, first element, # elements)
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Array.Clear(nameArray, 0, nameArray.Length);
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//Copy elements from one array to another
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Array.Copy(scr, target, numOfElements);
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3. String Operations
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//To concatenate between strings, use the plus operator:
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string firstName = "Erin";
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string lastName = "Roger";
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@ -68,27 +68,27 @@ CHEATSHEET C#
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//To add one string to another, use the += operator:
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string secondLastName = "Green";
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string fullName += secondLastName;
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//ToString function
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//It converts an object to its string representation so that it is suitable for display
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Object.ToString();
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//String formatting
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//Each additional argument to the function can be referred to in the string using the brackets operator with the index number.
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String.Format(String format, Object arg0);
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format - A composite format string that includes one or more format items
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format - A composite format string that includes one or more format items
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arg0 - The first or only object to format
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//Substring
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//Returns a part of the string, beginning from the index specified as the argument. Substring also accepts a maximum length for the substring
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String.Substring(beginAt);
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String.Substring(beginAt, maximum);
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//Replace
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string newStr = oldStr.Replace("old","new");
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//IndexOf
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//Finds the first ocurrence of a string in a larger string
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//Finds the first occurrence of a string in a larger string
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//Returns -1 if the string is not found
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String.IndexOf(val, start, num)
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val - string to search for
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@ -102,7 +102,7 @@ CHEATSHEET C#
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String.Split(Char[]);
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//ToCharArray
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//Places selected characteres in a string in a char array
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//Places selected characters in a string in a char array
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String str = "AaBbCcDd";
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//create array of 8 vowels
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var chars = str.ToCharArray();
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@ -132,11 +132,11 @@ CHEATSHEET C#
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DateTime nextYear = DateTime.AddYears(1);
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6. TimeSpan
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6.1 TimeSpan Constructor
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TimpeSpan(hour, minute, sec)
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TimeSpan(hour, minute, sec)
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TimeSpan timeS = new TimeSpan(10, 14, 50);
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TimeSpan timeS_Hours = TimeSpan.FromDays(3640);
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@ -144,8 +144,8 @@ CHEATSHEET C#
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Format item syntax: {index[,alignment][:format string]}
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index - Specifies element in list of values to which format is applied
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aligment - Indicates minimun width (in characters) to display value
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format string - Contains the code which specififes the format of the displayed value
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alignment - Indicates minimum width (in characters) to display value
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format string - Contains the code which specifies the format of the displayed value
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7.1 Numeric
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@ -168,7 +168,7 @@ CHEATSHEET C#
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csc -define:DEBUG -optimize -out:File2.exe *.cs -> Compiles all the C# files in the current directory with optimizations enabled and defines the DEBUG symbol. The output is File2.exe
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csc -target:library -out:File2.dll -warn:0 -nologo -debug *.cs -> Compiles all the C# files in the current directory producing a debug version of File2.dll. No logo and no warnings are displayed
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csc -target:library -out:Something.xyz *.cs -> Compiles all the C# files in the current directory to Something.xyz (a DLL)
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8.1 Compiler Options Listed
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Option Purpose
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@ -260,21 +260,21 @@ CHEATSHEET C#
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10. Loop
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10.1 While
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while (condition) {body}
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10.2 Do while
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do {body} while condition;
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10.3 For
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for (initializer; termination condition; iteration;) {
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//statements
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}
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10.4 For each
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foreach (type identifier in collection) {
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//statements
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}
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@ -293,7 +293,7 @@ CHEATSHEET C#
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[access modifier] className (parameters) [:initializer]
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initializer -base calls constructor in base class.
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this calls constuctor within class.
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this calls constructor within class.
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public class nameClass : Initializer {
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public className(dataType param1 , dataType param2, ...) : base(param1, param2)
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@ -313,8 +313,8 @@ CHEATSHEET C#
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abstract – must be implemented by subclass
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Passing parameters:
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1. By default, parametres are passed by value
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2. Passing by reference: ref, in and out modifers
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1. By default, parameters are passed by value
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2. Passing by reference: ref, in and out modifiers
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To pass a parameter by reference with the intent of changing the value, use the ref, or out keyword. To pass by reference with the intent of avoiding copying but not changing the value, use the in modifier
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@ -331,9 +331,9 @@ CHEATSHEET C#
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12. Struct
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12.1 Defining a structure
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[attribute][modifier] struct name [:interfaces] { struct-body }
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12.2 Class vs Structure
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-> Classes are reference types and structs are value types
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@ -378,7 +378,7 @@ CHEATSHEET C#
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//To declare an event inside a class, first a delegate type for the event must be declared.
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public delegate string MyDelegate(string str);
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//The event itself is declared by using the event keyword
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event MyDelegate MyEvent;
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@ -31,11 +31,11 @@ Preprocessor directives:
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Create and execute a program
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In Linux systems:
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In Linux systems:
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1. Open up a terminal
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2. Create the program: nano nameProgram.c
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3. Write the program and save it
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4. gcc -o nameExecutable nameProgram.c
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4. gcc -o nameExecutable nameProgram.c
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32 Reserved words
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@ -106,8 +106,8 @@ Operators
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( ) grouping parenthesis, function call
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[ ] array indexing, also [ ][ ] etc.
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-> selector, structure pointer
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. select structure element
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-> selector, structure pointer
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. select structure element
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! relational not, complement, ! a yields true or false
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~ bitwise not, ones complement, ~ a
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++ increment, pre or post to a variable
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@ -153,7 +153,7 @@ Operators
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Operator precedence
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More precedence
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LR ( ) [ ] -> . x++ x--
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@ -203,7 +203,7 @@ Function definition
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type function_name(int a, float b, const char * ch,...) { function_body }
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/* only parameters passed by address can are modified*/
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/* only parameters passed by address can are modified*/
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/* in the calling function, local copy can be modified*/
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@ -11,7 +11,7 @@ XML uses a DTD to describe the data.
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So the XML is a **Complement** to HTML.
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* HTML: is used to format and display the same data.
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XML does not carry any information about how to be displayed. The same XML data can be used in many different presentation scenarios.
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Because of this, with XML, there is a full separation between data and presentation.
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@ -46,7 +46,7 @@ CTRL+X then ( # start recording a keyboard macro
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CTRL+X then ) # finish recording keyboard macro
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CTRL+X then E # recall last recorded keyboard macro
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CTRL+X then CTRL+E # invoke text editor (specified by $EDITOR) on current command line then execute resultes as shell commands
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CTRL+A then D # logout from screen but don't kill it, if any command exist, it will continue
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CTRL+A then D # logout from screen but don't kill it, if any command exist, it will continue
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BACKSPACE # deletes one character backward
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DELETE # deletes one character under cursor
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@ -94,7 +94,7 @@ cat <filename> # displays file raw content (will not be interpret
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cat -n <filename> # shows number of lines
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nl <file.sh> # shows number of lines in file
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cat filename1 > filename2 # Copy filename1 to filename2
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cat filename1 >> filename2 # merge two files texts together
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cat filename1 >> filename2 # merge two files texts together
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any_command > <filename> # '>' is used to perform redirections, it will set any_command's stdout to file instead of "real stdout" (generally /dev/stdout)
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more <filename> # shows the first part of a file (move with space and type q to quit)
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head <filename> # outputs the first lines of file (default: 10 lines)
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@ -203,14 +203,14 @@ echo $$ # prints process ID of the current shell
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echo $! # prints process ID of the most recently invoked background job
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echo $? # displays the exit status of the last command
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read <varname> # reads a string from the input and assigns it to a variable
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read -p "prompt" <varname> # same as above but outputs a prompt to ask user for value
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read -p "prompt" <varname> # same as above but outputs a prompt to ask user for value
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column -t <filename> # display info in pretty columns (often used with pipe)
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let <varname> = <equation> # performs mathematical calculation using operators like +, -, *, /, %
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export VARNAME=value # defines an environment variable (will be available in subprocesses)
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export -f <funcname> # Exports function 'funcname'
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export var1="var1 value" # Export and assign in the same statement
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export <varname> # Copy Bash variable
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declare -x <varname> # Copy Bash variable
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export <varname> # Copy Bash variable
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declare -x <varname> # Copy Bash variable
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array[0]=valA # how to define an array
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array[1]=valB
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@ -507,9 +507,9 @@ function returntrap {
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trap returntrap RETURN # is executed each time a shell function or a script executed with the . or source commands finishes executing
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##############################################################################
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# COLORS AND BACKGROUNDS
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# COLORS AND BACKGROUNDS
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##############################################################################
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# note: \e or \x1B also work instead of \033
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# note: \e or \x1B also work instead of \033
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# Reset
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Color_Off='\033[0m' # Text Reset
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@ -524,14 +524,14 @@ Cyan='\033[0;36m' # Cyan
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White='\033[0;97m' # White
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# Additional colors
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LGrey='\033[0;37m' # Ligth Gray
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LGrey='\033[0;37m' # Light Gray
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DGrey='\033[0;90m' # Dark Gray
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LRed='\033[0;91m' # Ligth Red
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LGreen='\033[0;92m' # Ligth Green
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LYellow='\033[0;93m'# Ligth Yellow
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LBlue='\033[0;94m' # Ligth Blue
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LRed='\033[0;91m' # Light Red
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LGreen='\033[0;92m' # Light Green
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LYellow='\033[0;93m'# Light Yellow
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LBlue='\033[0;94m' # Light Blue
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LPurple='\033[0;95m'# Light Purple
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LCyan='\033[0;96m' # Ligth Cyan
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LCyan='\033[0;96m' # Light Cyan
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# Bold
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@ -566,6 +566,6 @@ On_White='\033[47m' # White
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# Example of usage
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echo -e "${Green}This is GREEN text${Color_Off} and normal text"
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echo -e "${Red}${On_White}This is Red test on White background${Color_Off}"
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echo -e "${Red}${On_White}This is Red test on White background${Color_Off}"
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# option -e is mandatory, it enable interpretation of backslash escapes
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printf "${Red} This is red \n"
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@ -397,8 +397,8 @@ d, t := doubleAndTriple(5)
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_, t := doubleAndTriple(3)
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// t = 9
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// Functions can defer commands. Defered commands are
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// runned in a stack order after the execution and
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// Functions can defer commands. Deferred commands are
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// ran in a stack order after the execution and
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// returning of a function
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var aux = 0
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@ -488,7 +488,7 @@ person3.Age // 0
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## Maps
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Maps are data structures that holds values assigneds to a key.
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Maps are data structures that holds values assigned to a key.
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```go
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// Declaring a map
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@ -508,7 +508,7 @@ newYork // "EUA"
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// Delete
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delete(cities, "NY")
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// Check if a key is setted
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// Check if a key is set
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value, ok := cities["NY"]
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ok // false
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value // ""
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@ -600,7 +600,7 @@ Go doesn't support `throw`, `try`, `catch` and other common error handling struc
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```go
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import "errors"
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// Function that contain a logic that can cause a possible exception flow
|
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// Function that contain a logic that can cause a possible exception flow
|
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func firstLetter(text string) (string, error) {
|
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if len(text) < 1 {
|
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return nil, errors.New("Parameter text is empty")
|
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@ -632,7 +632,7 @@ func Sum(x, y int) int {
|
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}
|
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|
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// main_test.go
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import (
|
||||
import (
|
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"testing"
|
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"reflect"
|
||||
)
|
||||
@ -676,7 +676,7 @@ func main() {
|
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blocking2: 0
|
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blocking2: 1
|
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blocking2: 2
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done
|
||||
done
|
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*/
|
||||
|
||||
// Go routines are a function (either declared previously or anonymous) called with the keyword go
|
||||
|
||||
@ -204,7 +204,7 @@ a \|= b; //a is the variable name; b is the variable name; this expression is an
|
||||
}
|
||||
```
|
||||
**Example:**
|
||||
```java
|
||||
```java
|
||||
for (int i = 0; i <= n; i++) {
|
||||
System.out.println(i);
|
||||
}
|
||||
@ -254,10 +254,10 @@ for(dataType item : array) {
|
||||
|
||||
**Example:**
|
||||
```java
|
||||
int i=1;
|
||||
do{
|
||||
System.out.println(i);
|
||||
i++;
|
||||
int i=1;
|
||||
do{
|
||||
System.out.println(i);
|
||||
i++;
|
||||
}while(i<=10);
|
||||
```
|
||||
|
||||
@ -308,7 +308,7 @@ for(dataType item : array) {
|
||||
//Declare a variable, object name
|
||||
String s;
|
||||
|
||||
//Invoke a contructor to create an object
|
||||
//Invoke a constructor to create an object
|
||||
s = new String ("Hello World");
|
||||
|
||||
//Invoke an instance method that operates on the object's value
|
||||
@ -361,13 +361,13 @@ class MyClass {
|
||||
// four methods
|
||||
public void setCadence(int newValue) {
|
||||
cadence = newValue;
|
||||
}
|
||||
}
|
||||
public void setGear(int newValue) {
|
||||
gear = newValue;
|
||||
}
|
||||
}
|
||||
public void applyBrake(int decrement) {
|
||||
speed -= decrement;
|
||||
}
|
||||
}
|
||||
public void speedUp(int increment) {
|
||||
speed += increment;
|
||||
}
|
||||
@ -531,13 +531,13 @@ class MyClass extends MySuperClass implements YourInterface {
|
||||
|
||||
|
||||
```java
|
||||
interface print{
|
||||
void printPaper();
|
||||
}
|
||||
public class A4 implements print{
|
||||
interface print{
|
||||
void printPaper();
|
||||
}
|
||||
public class A4 implements print{
|
||||
public void printPaper(){
|
||||
System.out.println("A4 Page Printed. ");
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
@ -1,8 +1,8 @@
|
||||
<?php
|
||||
|
||||
// Exit the file, string inside get's echo'ed
|
||||
die("This file is not ment to be ran. ¯\_(ツ)_/¯");
|
||||
exit("This file is not ment to be ran. ¯\_(ツ)_/¯");
|
||||
die("This file is not meant to be ran. ¯\_(ツ)_/¯");
|
||||
exit("This file is not meant to be ran. ¯\_(ツ)_/¯");
|
||||
|
||||
/**
|
||||
* Printing
|
||||
@ -17,7 +17,7 @@ var_dump($arr); // Print anything, with type hints for any value and sizes
|
||||
$string = 'Awesome cheatsheets';
|
||||
|
||||
str_contains($string, 'cheat'); // Find if the string contains the specified string (PHP >= 8.0)
|
||||
str_replace('Awesome', 'Bonjour', $string); // Replace all occurence
|
||||
str_replace('Awesome', 'Bonjour', $string); // Replace all occurrence
|
||||
strcmp($string, 'Awesome cheatsheets'); // Compare two strings
|
||||
strpos($string, 'a', 0); // Get position in the string
|
||||
str_split($string, 2); // Split the string
|
||||
@ -189,7 +189,7 @@ $argc; // Number of arguments passed into terminal
|
||||
$myObject?->getName()?->startWith('A');
|
||||
|
||||
/**
|
||||
* Class
|
||||
* Class
|
||||
* http://php.net/manual/en/language.oop5.basic.php
|
||||
*/
|
||||
class NormalClass extends AbstractClassName implements InterfaceName
|
||||
@ -200,7 +200,7 @@ class NormalClass extends AbstractClassName implements InterfaceName
|
||||
// --> PROPERTY TYPES <--
|
||||
|
||||
/**
|
||||
* Public property, everyone can access this property.
|
||||
* Public property, everyone can access this property.
|
||||
* @var Type
|
||||
*/
|
||||
public $property;
|
||||
@ -251,7 +251,7 @@ class NormalClass extends AbstractClassName implements InterfaceName
|
||||
protected function protectedFunction(Type $var = null): Type
|
||||
{
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Static function, doesn't need an instance to be executed.
|
||||
* @param Type
|
||||
@ -541,7 +541,7 @@ u Pattern is treated as UTF-8
|
||||
\w Any "word" character (a-z 0-9 _)
|
||||
\W Any non "word" character
|
||||
\s Whitespace (space, tab CRLF)
|
||||
\S Any non whitepsace character
|
||||
\S Any non whitespace character
|
||||
\d Digits (0-9)
|
||||
\D Any non digit character
|
||||
. (Period) - Any character except newline
|
||||
|
||||
@ -44,7 +44,7 @@
|
||||
- As of python3.8 there are 35 keywords
|
||||
|
||||
| Keyword | Description | Category |
|
||||
|---------- | ---------- | --------- |
|
||||
|---------- | ---------- | --------- |
|
||||
| True | Boolean value for not False or 1 | Value Keyword|
|
||||
| False | Boolean Value for not True or 0 | Value Keyword |
|
||||
| None | No Value | Value keyword |
|
||||
@ -58,7 +58,7 @@
|
||||
| else | this block will be executed if condition is false | conditional |
|
||||
| for | used for looping | iteration |
|
||||
| while | used for looping | iteration |
|
||||
| break | get out of loop | iteration |
|
||||
| break | get out of loop | iteration |
|
||||
| continue | skip for specific condition | iteration |
|
||||
| def | make user defined function | structure |
|
||||
| class | make user defined classes | structure |
|
||||
@ -71,8 +71,8 @@
|
||||
| import | import libraries/modules/packages | import |
|
||||
| from | import specific function/classes from modules/packages | import |
|
||||
| try | this block will be tried to get executed | exception handling |
|
||||
| except | is any exception/error has occured it'll be executed | exception handling |
|
||||
| finally | It'll be executed no matter exception occurs or not | exception handling |
|
||||
| except | is any exception/error has occurred it'll be executed | exception handling |
|
||||
| finally | It'll be executed no matter exception occurs or not | exception handling |
|
||||
| raise | throws any specific error/exception | exception handling |
|
||||
| assert | throws an AssertionError if condition is false | exception handling |
|
||||
| async | used to define asynchronous functions/co-routines | asynchronous programming |
|
||||
@ -135,7 +135,7 @@
|
||||
- Lists are created using square brackets:
|
||||
|
||||
```python
|
||||
thislist = ["apple", "banana", "cherry"]
|
||||
thislist = ["apple", "banana", "cherry"]
|
||||
```
|
||||
|
||||
- List items are ordered, changeable, and allow duplicate values.
|
||||
@ -157,14 +157,14 @@ thislist = list(("apple", "banana", "cherry")) # note the double round-brackets
|
||||
- pop() function removes the last value in the given list by default.
|
||||
|
||||
```python
|
||||
thislist = ["apple", "banana", "cherry"]
|
||||
|
||||
thislist = ["apple", "banana", "cherry"]
|
||||
|
||||
print(thislist.pop()) # cherry
|
||||
print(thislist.pop(0)) #apple
|
||||
|
||||
print(thislist.pop(0)) #apple
|
||||
|
||||
```
|
||||
|
||||
|
||||
|
||||
|
||||
### Tuple
|
||||
|
||||
@ -291,14 +291,14 @@ thisdict = {
|
||||
"model": "Mustang",
|
||||
"year": 1964
|
||||
}
|
||||
|
||||
|
||||
x = car.pop("model")
|
||||
|
||||
|
||||
print(x)# Mustang
|
||||
print(car)#{'brand': 'Ford', 'year': 1964}
|
||||
```
|
||||
|
||||
|
||||
|
||||
|
||||
### Conditional branching
|
||||
|
||||
@ -378,5 +378,5 @@ function_name()
|
||||
```
|
||||
|
||||
* We need not to specify the return type of the function.
|
||||
* Functions by default return `None`
|
||||
* Functions by default return `None`
|
||||
* We can return any datatype.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user