commit 2b43adf72cc3ca8faa1c5e6d0a3bfc12309158d5 Author: Julien Le Coupanec Date: Thu Nov 9 02:49:11 2017 +0000 JavaScript: global objects > array diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1d74e21 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +.vscode/ diff --git a/cheatsheets/javascript.js b/cheatsheets/javascript.js new file mode 100644 index 0000000..b0eab0a --- /dev/null +++ b/cheatsheets/javascript.js @@ -0,0 +1,51 @@ +/* ******************************************************************************************* + * GLOBAL OBJECTS > ARRAY + * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array + * ******************************************************************************************* */ + + +// Global object: properties +Array.length // Reflects the number of elements in an array + +// Global object: methods +Array.from(arrayLike[, mapFn[, thisArg]]) // Creates a new Array instance from an array-like or iterable object. +Array.isArray(obj) // Returns true if a variable is an array, if not false. +Array.of(element0[, element1[, ...[, elementN]]]) // Creates a new Array instance with a variable number of arguments, regardless of number or type of the arguments. + +// Instance: properties +arr.length // Reflects the number of elements in an array. + +// Instance: mutator methods +arr.copyWithin(target, start, end) // Copies a sequence of array elements within the array. +arr.fill(value, start, end) // Fills all the elements of an array from a start index to an end index with a static value. +arr.pop() // Removes the last element from an array and returns that element. +arr.push([element1[, ...[, elementN]]]) // Adds one or more elements to the end of an array and returns the new length of the array. +arr.reverse() // Reverses the order of the elements of an array in place — the first becomes the last, and the last becomes the first. +arr.shift() // Removes the first element from an array and returns that element. +arr.sort() // Sorts the elements of an array in place and returns the array. +array.splice(start, deleteCount, item1, item2, ...) // Adds and/or removes elements from an array. +arr.unshift([element1[, ...[, elementN]]]) // Adds one or more elements to the front of an array and returns the new length of the array. + +// Instance: accessor methods +arr.concat(value1[, value2[, ...[, valueN]]]) // Returns a new array comprised of this array joined with other array(s) and/or value(s). +arr.includes(searchElement, fromIndex) // Determines whether an array contains a certain element, returning true or false as appropriate. +arr.indexOf(searchElement[, fromIndex]) // Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. +arr.join(separator) // Joins all elements of an array into a string. +arr.lastIndexOf(searchElement, fromIndex) // Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. +arr.slice(begin, end) // Extracts a section of an array and returns a new array. +arr.toString() // Returns a string representing the array and its elements. Overrides the Object.prototype.toString() method. +arr.toLocaleString(locales, options) // Returns a localized string representing the array and its elements. Overrides the Object.prototype.toLocaleString() method. + +// Instance: iteration methods +arr.entries() // Returns a new Array Iterator object that contains the key/value pairs for each index in the array. +arr.every(callback[, thisArg]) // Returns true if every element in this array satisfies the provided testing function. +arr.filter(callback[, thisArg]) // Creates a new array with all of the elements of this array for which the provided filtering function returns true. +arr.find(callback[, thisArg]) // Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. +arr.findIndex(callback[, thisArg]) // Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. +arr.forEach(callback[, thisArg]) // Calls a function for each element in the array. +arr.keys() // Returns a new Array Iterator that contains the keys for each index in the array. +arr.map(callback[, initialValue]) // Creates a new array with the results of calling a provided function on every element in this array. +arr.reduce(callback[, initialValue]) // Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. +arr.reduceRight(callback[, initialValue]) // Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. +arr.some(callback[, initialValue]) // Returns true if at least one element in this array satisfies the provided testing function. +arr.values() // Returns a new Array Iterator object that contains the values for each index in the array.