JavaScript Strings

• Text Representation: Strings in JavaScript are used to represent textual data. They are enclosed within either single quotes (‘…’), double quotes (“…”), or backticks (“).

• Examples:

  JavaScript

   

  const greeting = "Hello, world!";
  const name = 'John Doe';
  const multilineString = `This is a
  multiline string`; 
  

• String Methods: JavaScript provides a rich set of methods for manipulating strings:

  • length: Returns the number of characters in the string.
  • toUpperCase(): Converts the string to uppercase.
  • toLowerCase(): Converts the string to lowercase.
  • indexOf(): Finds the index of the first occurrence of a substring.
  • slice(): Extracts a portion of the string.
  • concat(): Concatenates two or more strings.
  • split(): Splits a string into an array of substrings.
  • replace(): Replaces occurrences of a specified substring with another string.
  • trim(): Removes whitespace from both ends of the string.

• Template Literals: Backticks (“) allow for embedded expressions within strings:

  JavaScript

   

  const name = "Alice";
  const message = `Hello, ${name}!`; // Output: "Hello, Alice!"
  

Strings are fundamental in JavaScript, used for displaying text, handling user input, and building dynamic content within web pages.