JavaScript Array is used to store multiple elements in a single variable. It is often used when we want to store a list of elements and access them by a single variable. Unlike most languages where the array is a reference to the multiple variables, in JavaScript array is a single variable that stores multiple elements.
Syntax:
const arr = ["Item1", "Item2", "Item3", ...];
Example: In this example, we are creating an array and copying its items to another array, and displaying its items.
JavaScript
<script>
let items = [ 'GFG' , 'Geeks' , 'G4G' ];
console.log(items);
let new_Array = [];
items.forEach( function (item) {
new_Array.push(item);
});
console.log(new_Array);
</script>
|
Output:
Original Array: GFG, Geeks, G4G
Copied Array: GFG, Geeks, G4G
The complete list of JavaScript Array is listed below:
JavaScript Array Constructor: In JavaScript, a constructor gets called when an object is created using the new keyword.
Constructor
|
Descriptions
|
Examples
|
Array() |
It is used to create an array. |
|
JavaScript Array Properties: A JavaScript property is a member of an object that associates a key with a value.
JavaScript Array Methods: JavaScript methods are actions that can be performed on objects.
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Static Method: If the method is called using the array class itself then it is called a static method.
Static Methods
|
Descriptions
|
Examples
|
from() |
Returns an array object from any object with a length property or an iterable object. |
|
isArray() |
Returns true if the argument passed is an array else it returns false. |
|
of() |
Creates a new array instance with variables present as the argument of the function. |
|
-
Instance Method: If the method is called on an instance of a array then it is called an instance method.
Instance Methods
|
Descriptions
|
Examples
|
at() |
Returns the element of that index |
|
concat() |
Merge two or more arrays together. |
|
copyWithin() |
Copies part of an array to the same array itself and returns. |
|
entries() |
Fetch all the entries of the same data structure. |
|
every() |
checks that whether all the elements of the array satisfy the given condition. |
|
fill() |
Fill the array with a given static value. |
|
filter() |
Builds a new array containing elements that satisfy a function’s test. |
|
find() |
Get the value of the first element in the array that satisfies the provided condition. |
|
findIndex() |
Return the first index of the element in a given array that satisfies the provided testing function. |
|
flat() |
Flatten an array, to reduce the nesting of an array. |
|
flatMap() |
This is used to flatten the input array element into a new array. |
|
forEach() |
It is provided a function once for each element of the array. |
|
includes() |
If an array contains the certain value, it returns true. |
|
indexOf() |
Return the first index at which a given element may be found, or -1 if it does not exist. |
|
join() |
Join the elements of an array into a string. |
|
keys() |
Return a new array iterator which contains the keys for each index in the given input array. |
|
lastIndexOf() |
Return the last index at which a given element may be found, or -1 if it does not exist. |
|
map() |
Calls the argument function once for each element of the given array in order. |
|
pop() |
Remove the last element of the array and also returns the removed element. |
|
push() |
Push one or more values into the array. |
|
reduce() |
Reduce the array to a single value and executes a provided function for each value of the array. |
|
reduceRight() |
Convert elements of the given array from right to left to a single value. |
|
reverse() |
This is used for the in-place reversal of the array. |
|
shift() |
Removes the first element of the array thus reducing the size of the original array by 1. |
|
slice() |
Returns a new array containing a portion of the array on which it is implemented. |
|
some() |
Each array element’s callback function is run once. |
|
sort() |
Sort an array in place in a given order according to the compare() function. |
|
splice() |
Modify the contents of an array by removing the existing elements. |
|
toLocaleString() |
Convert the elements of the given array to string. |
|
toString() |
Return the string representation of the array elements. |
|
unshift() |
Add one or more elements to the beginning of the given array. |
|
values() |
Return a new array Iterator object that contains the values for each index in the array. |
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