The filter() method creates a new array by selecting elements that meet a specific condition. It does not modify the original array and ignores empty elements.

• filter() returns a new array with elements that pass the given test.
• The condition is checked using a callback function like canVote().
• Only elements for which canVote() returns true are included in the new array.

function canVote(age) {
    return age >= 18;
}

let filtered = [24, 33, 16, 40].filter(canVote);
console.log(filtered);

Syntax

array.filter(callback(element, index, arr), thisValue)

Parameters: This method accepts five parameters as mentioned above and described below: 

Return value: It returns an array of elements that pass the test and an empty array if no elements pass the test. 

Example 1: Creating a new array consisting of only those elements that satisfy the condition checked by isPositive() function.

function isPositive(value) {
    return value > 0;
}

let filtered = [112, 52, 0, -1, 944].filter(isPositive);
console.log(filtered);

Example 2: Creating a new array consisting of only those elements that satisfy the condition checked by isEven() function. 

function isEven(value) {
    return value % 2 === 0;
}

let filtered = [11, 98, 31, 23, 944].filter(isEven);
console.log(filtered);