Methods in Javascript

Declaration and interpolation of string:-

let name = "pashupati"           
const adharId = "84930384939"

• Using let:

  • Declare a variable: let name;

  • Assign a string value: name = "pashupati";

• Using const:

  • Declare a constant variable: const adharId = "84930384939";

    String Interpolation:-

    A common way to achieve string interpolation in JavaScript is by using template literals. Here's an example:

      console.log(`my real name is ${name}  and my adharnumber ${adharId}`);
    

    Sample code to understand below related code:-

      let gameName = new String ("Pubgmob")
      console.log(gameName);
    

    Following are the methods of string in JavaScript:-

  • Length

  • toUpperCase

  • charAt

  • indexOf

  • substring

  • slice

  • trim

  • replaces

  • includes

    Length Method:-

      let gameName = new String ("Pubgmob")
      console.log(gameName.length);
    

    0=>P

    1=>u

    2=>b

    3=>g

    4=>m

    5=>o

    6=>b

    Uppercase Method:-

      let gameName = new String ("Pubgmob")
      console.log(gameName.toUpperCase);method do operation on the string n make string in uppercase
    

  • method do operation on the string and make string in uppercaseOriginal.

  • The string is not changed Due to the heap memory Concept.

charAt:-

    let gameName = new String ("Pubgmob")
    console.log(gameName.charAt(2));

• To know which string character is at the position of index no.2

indexOf:-

let gameName = new String ("Pubgmob")
console.log(gameName.indexOf('u'));

To know the string character (given in the console log) at which index no.

substring:-

let gameName = new String ("Pubgmob")
let newGameName = gameName.substring(0, 3)

it gives the values from index no.0 to index no.2 (Excluded end parameter)it does

take negative values like a slice

slice:-

let gameName = new String ("Pubgmob")
let anotherGameName = gameName.slice(1, 5)

it gives value from index no,1 to index no.5

it takes the value of index no.5

Trim:-

let gameName = new String ("Pubgmob")
let anotherGameName = gameName.slice(-6, 3)

Negative values are allowed in the slice method unless like substring

-6===> It counts value back from index no.6 to index no.3

Replace:-

const url = "pashuapti20%bansode.com"
console.log(url.replace('20%', '-'))

• The replace method will find the 20% inside the string and it is replaced by -

includes:-

const url = "pashuapti20%bansode.com"
console.log(url.includes('pashuapati'));

it will ask the question to string like is pashuapti present in the string?

it returns the value in a boolean like true or false.