JavaScript String

String represents and manipulates a sequence of characters. A string is an array-like object but not an array.

JavaScript String Methods and Properties

charAt()

To get a specified index of a character.
Syntax:

let text = "Hello JavaScript";
let letter = text.charAt(0);
console.log(letter)
/* Output:
H
*/

charCodeAt()
To get a specified index Unicode of the character
Syntax:
let text = "Hello JavaScript";
let code = text.charCodeAt(0);
console.log(code)
/* Output:
72
*/

concat()

To joins two or more string
Syntax:
let text1 = "Hello";
let text2 = "JavaScript";
let result = text1.concat(text2);
console.log(result)
/* Output:
Hello JavaScript
*/

endsWith()

To Check if a string ends with specified string/characters it returns true or false.
Syntex:
let text = "Hello world";
let result = text.endsWith("Hello");
console.log(result)
/* Output:
false
*/


fromCharCode()

Converts Unicode values to characters.
Syntex:
let text = String.fromCharCode(65);
console.log(text)
/* Output:
A
*/

includes()

To check if a string contains the specified string/characters reuters ture and false.
Syntex:
let text = "Hello JavaScript, welcome to the JavaScript world.";
let result = text.includes("welcome");
console.log(text)
/* Output:
true
*/


indexOf()

Check if first found occurrence of a specified value in a string return if exist 0 if not exist -1.
Syntex:
let text = "Hello JavaScript, welcome to the JavaScript world.";
let result = text.indexOf("JavaScript");
console.log(text)
/* Output:
0
*/

lastIndexOf()

Returns the position of the last found occurrence of a specified value in a string.
Syntax:
let text = "Hello planet earth, you are a great planet.";
let result = text.lastIndexOf("planet");
console.log(text)
/* Output:
36
*/

localeCompare()

Compare two strings in the current locale.
Syntex:
let text1 = "abc";
let text2 = "def";
let result = text1.localeCompare(text2);
console.log(result)
/* Output:
-1
*/

match()

Searches a string for a match against a regular expression, and returns the matches.
`let text = "Hello JavaScript, welcome to the JavaScript world.";
let result = text.match(/rip/g);
console.log(result);
/* Output:
rip, rip
*/


repeat()
Returns a new string with a specified number of copies of an existing string.
let text = "Hello JavaScript! ";
let result = text.repeat(2);
console.log(result);
/* Output:
Hello JavaScript! Hello JavaScript!
*/`

replace()

Searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced.
Syntax:
let text = "Hello PHP, welcome to the PHP world.";
let result = text.replace("PHP", "JavaScript");
console.log(result)
/* Output:
Hello JavaScript, welcome to the JavaScript world.
*/


search()

Searches a string for a specified value, or regular expression, and returns the position of the match.
Syntax:
let text = "Hello JavaScript, welcome to the JavaScript world."
let position = text.search("world");
console.log(position )
/* Output:
44
*/


slice()

Extracts a part of a string and returns a new string.
Syntax:
let text = "Hello JavaScript";
let result = text.slice(0, 10);
console.log(result )
/* Output:
Hello Java
*/


split()

Splits a string into an array of substrings.

Syntax:
let text = "Hello JavaScript, welcome to the JavaScript world."
const myArray = text.split(" ");
console.log(myArray)
/* Output:
[ "Hello", "JavaScript,", "welcome", "to", "the", "JavaScript", "world." ]
*/


toLowerCase()

Converts a string to Lowercase letters
Syntax:
let text = "Hello World!";
let result = text.toLowerCase();
console.log(result);
/*
Output:
hello world
*/

toUpperCase()

Converts a string to uppercase letters
Syntax:
let text = "Hello World!";
let result = text.toUpperCase();
console.log(result);
/*
Output:
HELLO WORLD
*/


trim()

Removes whitespace from both ends of a string
Syntax:
let text = " Hello World! ";
let result = text.trim();
console.log(result);
/*
Output:
Hello World
*/