The JavaScript Array object is a global object that is used in the construction of arrays; which are high-level, list-like objects. Note that this special case only applies to JavaScript arrays created with the Array constructor, not array literals created with the bracket syntax. If the argument is any other number, a exception is thrown. Description Arrays are list-like objects whose prototype has methods to perform traversal and mutation operations. Neither the length of a JavaScript array nor the types of its elements are fixed. Since an array's length can change at any time, and data can be stored at non-contiguous locations in the array, JavaScript arrays java script array not guaranteed to be dense; this depends on how the programmer chooses to use them. In general, these are convenient characteristics; but if these features are not desirable for your particular use, you might consider using typed arrays. Arrays cannot use strings as element indexes as in an but must use integers. Setting or accessing via non-integers using or will not set or retrieve an element from the array list itself, but will set or access a variable associated with that array's. The array's object properties and list of array elements are separate, and the array's cannot be applied to these named properties. Accessing array elements JavaScript arrays are zero-indexed: the first java script array of an array is at index 0, and the last element is at the index equal to the value of the array's property minus 1. Using an invalid index number returns undefined. JavaScript properties that begin with a digit cannot be referenced with dot notation; and must be accessed using bracket notation. For example, if you had an object with a property named '3d', it can only be referenced using bracket notation. It's possible to quote the JavaScript array indexes as well e. It is, for this reason, that '2' and '02' would refer to two different slots on the years object and the following example could be true: console. Several of the built-in array methods e. Creating an array using the result of a match The result of a match between a regular expression and a string can create a JavaScript array. This array has properties and elements which provide information about the match. Such an array is returned by, and. The number of possible parenthesized substrings is unlimited. The constructor function that is used to create derived objects. Allows the addition of properties to all array objects. Methods Creates a new Array instance from an array-like or iterable object. Returns true if a variable is an array, if not false. Creates a new Array instance with a variable number of arguments, regardless of number or type of the arguments. Array instances All Array instances inherit from. The prototype object of the Array constructor can be modified to affect all Array instances. Properties These methods modify the array: Copies a sequence of array elements within the array. Fills all the elements of an array from a start index to an end index with a static value. Removes the last element from an array and returns that element. Adds one or more elements to the end of an array and returns the new length of the array. Reverses the order of the elements of an array in place — the first becomes the last, and the last becomes the first. Removes the first element from an array and returns that element. Sorts the elements of an array in place and returns the array. Adds one or more elements to the front of an array and returns the new length of the array. Accessor methods These methods do not modify the array java script array return some representation of the java script array. Determines whether an array contains a certain element, returning true or false as appropriate. Returns the first least index of an element within the array equal to the specified value, or -1 if none is found. Joins all elements of an array into a string. Returns the last greatest index of an element within the array equal to the specified value, or -1 if none is found. Extracts a section of an array and returns a new array. Returns an array literal representing the specified array; you can use this value to create a new array. Returns a string representing the array and its elements. Returns a localized string representing the array and its elements. Iteration methods Several methods take as arguments functions to be called back while processing the array. When these methods are called, the length of the array is sampled, and any element added beyond this length from java script array the callback is not visited. Other changes to the array setting the value of or deleting an element may affect the results of the operation if the method visits the changed element afterwards. While the specific behavior of these methods in such cases is well-defined, you should not rely upon it so as not to confuse others who might read your code. If you must mutate the array, copy into a new array instead. Returns true if every element in this array satisfies the provided testing function. Creates a new array with all of the elements of this array for which the provided filtering function returns true. Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. Calls a function for each element in the array. Returns a new Array Iterator that contains the keys for each index in the array. Creates a new array with the results of calling a provided function on every element in this array. Apply a function against an accumulator and each value of the array from left-to-right as to reduce it to a single value. Apply a function against an accumulator and each value of the array from right-to-left as to reduce it to a single value. Returns true if at least one element in this array satisfies the provided testing function. Returns a new Array Iterator object that contains the values for each index in the array. Returns a new Array Iterator object that contains the values for each index in the array. Array generic methods Array generics are non-standard, deprecated and will get removed in the near future. Sometimes you would like to apply array methods to strings or other array-like objects such as function. By doing this, you treat a string as an array of characters or otherwise treat a non-array as an array. As a standard alternative, you can convert your object to a proper array java script array ; although that method may not be supported in old browsers: if Array. The first move is made by copying the 'p' in 6,4 to 4,4. The old position 6,4 is made blank. Chrome Full support Yes Edge Full support Yes Firefox Full support 1. Chrome Full support Yes Java script array Full support Yes Firefox Full support 1. Firefox Android Full support 48 Opera Android. Firefox Android Full support 48 Opera Android. Expect behavior to change in the future. Expect behavior to change in the future. Not for use in new websites. Not for use in new websites. User must explicitly enable this feature. User must explicitly enable this feature.
