String Method in JavaScript

JavaScript provides a wide range of string methods to manipulate and work with text efficiently. Here’s a comprehensive list:

Basic String Methods

1. length – Returns the length of a string.

   let text = "Hello, JavaScript!"; console.log(text.length); // Output: 18

2. charAt(index) – Returns the character at a specific index.

   console.log("Hello".charAt(1)); // Output: "e"

3. charCodeAt(index) – Returns the Unicode value of a character at a given index.

   console.log("Hello".charCodeAt(1)); // Output: 101 (Unicode for 'e')

4. at(index) – Similar to charAt(), but supports negative indexing.

   console.log("Hello".at(-1)); // Output: "o"

String Manipulation Methods

1. toUpperCase() – Converts a string to uppercase.

   console.log("hello".toUpperCase()); // Output: "HELLO"

2. toLowerCase() – Converts a string to lowercase.

   console.log("HELLO".toLowerCase()); // Output: "hello"

3. trim() – Removes whitespace from both ends of a string.

   console.log(" Hello World! ".trim()); // Output: "Hello World!"

4. trimStart() / trimEnd() – Removes whitespace from the start or end.

   console.log(" Hello".trimStart()); // Output: "Hello" console.log("Hello ".trimEnd()); // Output: "Hello"

JavaScript provides a variety of string methods. Here’s a list of commonly used string methods:

charAt(index): Returns the character at the specified index.

charCodeAt(index): Returns the Unicode of the character at the specified index.

concat(string1, string2, ...): Combines two or more strings.

includes(searchString, position): Checks if a string contains a specified substring.

indexOf(searchValue, fromIndex): Returns the index of the first occurrence of a specified value.

lastIndexOf(searchValue, fromIndex): Returns the index of the last occurrence of a specified value.

match(regexp): Retrieves the matches when matching a string against a regular expression.

replace(searchValue, newValue): Replaces a specified value with another value in a string.

search(regexp): Tests for a match in a string and returns the index of the match.

slice(start, end): Extracts a section of a string and returns it as a new string.

split(separator, limit): Splits a string into an array of substrings.

substring(start, end): Returns a part of the string between two specified indices.

toLowerCase(): Converts a string to lowercase letters.

toUpperCase(): Converts a string to uppercase letters.

trim(): Removes whitespace from both ends of a string.

valueOf(): Returns the primitive value of a string object.