Javascript

JavaScript 21 String Methods Cheat Sheet 2021

JavaScript 21 String Methods Cheat Sheet 2021

Hello guy’s welcome back to my blog. Today in this blog post, I am going to tell you, JavaScript 21 String Methods Cheat Sheet 2021.

JavaScript 21 String Methods Cheat Sheet 2021
JavaScript 21 String Methods Cheat Sheet 2021

1 .length – Finding the length of the string:

var str = 'this string has 29 characters';

console.log(str.length);

//29

2 .trim() – Removing white space:

var str = '    this string has 29 characters';

console.log(str.trim());

//this string has 29 characters

3 .includes() – Check if string contains substring:

var str = 'Jassa therichpost';

var str2 = 'Jassa';

var str3 = 'Ajay';

console.log(str.includes(str2));
//true

console.log(str.includes(str3));
//false

4 .indexOf() — Find the index of a substring:

var str = 'Jassa therichpost';

var str2 = 'Jassa';

var str3 = 'Ajay';

console.log(str.indexOf(str2));

//0

console.log(str.indexOf(str3));

//-1

5 .toUpperCase() — Capitalizes entire string:

var str = 'jassa therichpost';

console.log(str.toUpperCase());

//JASSA THERICHPOST

6 .toLowerCase() — Lower cases entire string:

var str = 'JaSsa therichPost';

console.log(str.toLowerCase());

//jassa therichpost

7 .replace() — Replaces strings with new values:

var str = 'Jassa therichpost';

var str1 = 'Jassa';

var str2 = 'Ajay';

console.log(str.replace(str1, str2));

//Ajay therichpost

8 .slice() — Return a section of a string:

var str = 'Jassa therichpost';

console.log(str.slice(2));

//ssa therichpost

9 .split() — Converts string into an array of strings:

var str = 'Jassa therichpost';

console.log(str.split(" "));

//["Jassa", "therichpost]

10 .repeat() — Repeats a string a specified number of times:

var str = 'Jassa therichpost. ';

console.log(str.repeat(2));

//Jassa therichpost. Jassa therichpost.

11 .match() — Returns array of matching strings:

var str = 'Jassa therichpost';

var str1 = 'Jassa';

console.log(str.match(str1));

//["Jassa"]

12 .charAt() — Returns the character at an index:

var str = 'Jassa therichpost';
  
console.log(str.charAt(2));

//s

13 .charCodeAt() —Return the unicode at an index:

var str = 'Jassa therichpost';
  
console.log(str.charCodeAt(2));

//115

14 .concat() – Adding the two strings:

var str = 'Jassa therichpost ';

var str1 = 'Ajay';

console.log(str.concat(str1));

//Jassa therichpost Ajay

15 .search() – Find the string:

var str = 'Jassa therichpost ';

var str1 = 'Jassa';

console.log(str.search(str1));

//0 means true

//if it will -1 then string not there

16 .substring() – Extracts the characters from a string:

var str = 'Jassa therichpost ';
  
console.log(str.substring(8, 11));

//eri

17 .substr()- Extracts parts of a string:

var str = 'Jassa therichpost ';
  
console.log(str.substr(8, 11));

//erichpost

18 .valueOf() – Return the primitive value of the string:

var str = 'Jassa therichpost ';
  
console.log(str.valueOf());

//Jassa therichpost

19 .startsWith() – Check if a string starts with:

var str = 'Jassa therichpost ';
  
console.log(str.startsWith('Jassa'));

//true

20 .endsWith() – Check if a sting ends with:

var str = 'Jassa therichpost';
  
console.log(str.endsWith('therichpost'));

//true

21 .lastIndexOf() – returns the position of the last occurrence of a specified value in a string:

var str = 'Jassa therichpost';
  
console.log(str.lastIndexOf('therichpost'));

//6

This is it guy’s. I will come with more post which will helpful to all. If you have any kind of query then please comment below.

Jassa

Thanks.

Ajay Malhotra
the authorAjay Malhotra
Hello to all. Welcome to therichpost.com. Myself Ajay Malhotra and I am freelance full stack developer. I love coding. I know WordPress, Core php, Angularjs, Angular 2, Angular 6, Angular 7, Angular 8, Angular 9, Angular 10, Angular 11, Angular12, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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