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.

JavaScript Array methods are listed below:

JavaScript Array concat() Method

The arr.concat() method is used to merge two or more arrays together. This method does not alter the original arrays passed as arguments. For example:

var num1 = [11, 12, 13],

num2 = [14, 15, 16],

num3 = [17, 18, 19];

print(num1.concat(num2, num3));

output: [11,12,13,14,15,16,17,18,19]

JavaScript Array filter() Method

The arr.filter() method is used to create a new array from a given array consisting of only those elements from the given array which satisfy a condition set by the argument method.

    // JavaScript to illustrate findIndex() method
    function canVote(age) {
        return age >= 18;
    function func() {
        var filtered = [24, 33, 16, 40].filter(canVote);
  • Output: [24,33,40]

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JavaScript Array Complete Reference – GeeksforGeeks
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