All string methods in JavaScript provides a variety of built-in methods for working with strings. Here’s a list of some commonly used string methods in JavaScript.
CharAt(index):
Returns the character at the specified index.
var str = “Hello”;
var char = str.charAt(1);
// Returns ‘e’
CharCodeAt String Methods in Javascript:
Returns the Unicode value of the character at the specified index All String Methods in Javascript.
javascript
var str = “Hello”;
var unicode = str.charCodeAt(1);
// Returns 101
Concat(str1, str2, …):
Combines two or more strings in javascript.
javascript
var str1 = “Hello world”;
var result = str1.concat;
// Returns ‘Hello World’.
IndexOf(searchValue, startIndex):
Returns the index of the first occurrence of a specified value in a string.
javascript
var str = “Hello World”;
var index = str.indexOf(“o”);
// Returns.
LastIndexOf(searchValue, startIndex):
Use the indexOf method to return the position of the first occurrence of specified character(s) in a string.
javascript
var str = “Hello World”;
var index = str.lastIndexOf(“o”);
// Returns 7
Slice(startIndex, endIndex):
Extracts a section of a string and returns a new string.
javascript
var str = “Hello World”;
var newStr = str.slice(6, 11);
// Returns ‘World’
Substring(startIndex, endIndex):
Extracts a specified number of characters from a string.
javascript
var str = “Hello World”;
var newStr = str.substring(6, 11);
// Returns ‘World’
Substring(length):
Extracts a specified number of characters from a string.
javascript
var str = “Hello World”;
var newStr = str.substr(6, 5);
// Returns ‘World’
ToLowerCase()String Methods in Javascript:
Converts all characters in a string to lowercase.
javascript
var str = “Hello World”;
var lowerStr = str.toLowerCase();
// Returns ‘hello world’
ToUpperCase():
Converts all characters in a string to uppercase.
javascript
var str = “Hello World”;
var upperStr = str.toUpperCase();
// Returns ‘HELLO WORLD’
trim()string Methods in Javascript:
Removes whitespace from both ends of a string in javascript.
javascript
var str = ” Hello World “;
var trimmedStr = str.trim();
// Returns ‘Hello World’
Replace(searchValue, replaceValue):
The replace Value parameter is the string that will replace the search Value.
javascript
var str = “Hello World”;
var newStr = str.replace(“World”, “Universe”);
// Returns ‘Hello Universe’.
These are some just of the commonly used in javascript and you can always refer to the official documentation for more details and examples.
