String Methods in JavaScript

Strings are sequence of characters , that are used to store text. They are denoted by single and double quotes.

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The following are some string methods provided by JavaScript :

1. charAt( ) : It takes a index as argument and returns character present at that index.

let str = "Iron";
console.log(charAt(1));   //  gives -> 'r'

2. toLowerCase( ) : Takes string as argument an returns the string converted to lower case.

let str = "IRON MAN";
console.log(str.toLowerCase());  // "iron man" 

3. toUpperCase( ) : Take a string as argument and retrurn the string in upper case.

let str = " iron man";
console.log(str.toUpperCase());  // "IRON MAN"

4. replace( ) : The method returns a new string with one, some, or all matches of a pattern.

let str = "Rohan is going back home.";
console.log(str.replace("Rohan","He")); // "He is going back home."

5. substring( ) : It takes two arguments , first start index and second end index and returns back string with that index range.

let str = "Sweet Home";
console.log(str.substring(0,6)); // "Sweet"

6. trim( ) : It removes the whitespaces from the start and end of string.

let email = "   tony@4gmail.com   ";
console.log(email.trim());  // "tony@4gmail.com"

7. split( ) : It takes a pattern and divides the string on basis of that and returns back array of substring.

let str = "Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec";
let months = str.split(",");
console.log(months); // ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"]

8. indexOf( ) : It takes sequence and returns first index from which it starts.

let str = "Iron Man";
console.log(str.indexOf('I'));  // 0