Most Commonly Used JavaScript Methods in 2023

Here is my list of the most commonly used JavaScript methods. If I missed something please comment.

LENGTH
The Length method is use for get the numbers of characters in a string including white space.

const str = "Thisis my code";
console.log(str.length);

Output: 14

You can use also this method to get the length of any array in Javascript.

SLICE
slice() method is use for extracts a part of a string from a string and returns the extracted part in new string.

const str1 = 'Thisismycode';
var output = str1.slice(6 , 12);

console.log(output);
// Output: code

REPLACE
The replace() method is use for replace a specific value with another value in a string.

// replace method
const str2 = 'Thisismycode';
var output1 = str2.replace('my' , 'our');

console.log(output1);
// output: Thisisourcode

UPPER AND LOWER CASE
toLowerCase() method is use to convert the all character of a string into lower case and toUpperCase() method is use to convert the all character of a string into upper case.

// upper and lower case method
const str3 = 'ThisismyCode';
var output2 = str3.toLowerCase();
var output3 = str3.toUpperCase();

console.log(output2);
console.log(output3);

// Output: 
thisismycode
THISISMYCODE

CONCAT
The method concat() is use for join two or more string.

// concat method
const str4 = 'Thisismy';
var output4 = str4.concat('code');

console.log(output4);

// output: Thisismycode

Here is another great example of how to concatenate two strings in javascript.

TRIM
The trim() method removes the white space from both side in a string.

// trim method
const str5 = '     i love my code      ';
var output5 = str5.trim();

console.log(output5);

// output: 
i love my code

CHARAT
The charAt() method is use for get a character at a specific index from a string.

// charat method
const str6 = 'ILoveMyCode';
var output6 = str6.charAt(5);

console.log(output6);

//outout: M

SPLIT
The split() method is use to converts a string into an array.

// split method
const str7 = 'I ,Love ,My ,Code';
var output7 = str7.split(',');

console.log(output7);

//output: 
[ 'I ', 'Love ', 'My ', 'Code' ]

Please comment your thoughts about it or just like it :)

Comments

[LaTisha Douglas]

Thank you very much! I am new to coding and this was very informative. :)

[Kate Galushko]

@tishluvtech You are welcome :)