Must Know JavaScript Methods

toString9

Returns a string representing the specified object.

const arr = [1, 2, 'a', 'b'];

let num = 5;

console. log(arr. toString());

// Output: "1, 2, a, b"

console . log(num. toString());

// Output: "5'

join

Returns a new string by concatenating all of the elements in an array.

const el = ['Fire' , 'Air', "Water"];

console.log(el.join());

// Output: "Fire, Air, water"

console. log(el. join (''));

// Output "FireAirWater"

console. log(el. join('-'));

// Output: "Fire-Air-Water"

push

Add one or more elements to the end of an array.

const arr = ['a', 'b'];

arr. push('c');

console. log(arr);

// Output: ["a", "b", "c"]

console. log(arr. push('d'));

// Output: "d"

reverse

Reverses the order of the elements in an array.

const arr =[1, 2, 3];

arr. reverse();

console. log(arr);

// Output: [3,2,1]

pop

Returns the last element from an array.

const arr = ['a', 'b', 'c'];

arr. pop();

console. log (arr);

// Output: ["a", "b"]

console. log(arr. pop());

// Output: "b"

search

Searches a string for a specified value and returns the position of the match.

let txt = "This is easy";

console. log (txt. search ('easy'));

// Output: 8

indexOf

const arr = ['x' , 'y', 'z'];

console. log(Arr. indexOf('y'));

// Output: 1

console. log(Arr. indexOf('w'));

 // Output: -1

replace

Search the array for an element and returns its position.

let txt = "this is easy";

console. log(txt. replace('easy' , 'simple'));

// output: "this is simple"