JavaScript provides a variety of methods for manipulating and working with strings. Here is a comprehensive list of the commonly used string methods:

String Creation Methods

String(): Creates a new String object.

Character Methods

charAt(index): Returns the character at the specified index.
charCodeAt(index): Returns the Unicode of the character at the specified index.
codePointAt(index): Returns the Unicode code point of the character at the specified index.

String Manipulation Methods

concat(string1, string2, ...): Joins two or more strings and returns a new string.
includes(searchString, position): Determines whether a string contains the characters of a specified string.
endsWith(searchString, length): Determines whether a string ends with the characters of a specified string.
startsWith(searchString, position): Determines whether a string begins with the characters of a specified string.
indexOf(searchValue, fromIndex): Returns the index of the first occurrence of a specified text in a string.
lastIndexOf(searchValue, fromIndex): Returns the index of the last occurrence of a specified text in a string.
match(regex): Searches a string for a match against a regular expression and returns the matches.
matchAll(regex): Returns an iterator of all results matching a string against a regular expression.
replace(searchValue, newValue): Replaces a specified value with another value in a string.
replaceAll(searchValue, newValue): Replaces all occurrences of a specified value with another value in a string.
slice(start, end): Extracts a part of a string and returns a new string.
split(separator, limit): Splits a string into an array of substrings.
substring(start, end): Extracts characters from a 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.
trimStart() or trimLeft(): Removes whitespace from the beginning of a string.
trimEnd() or trimRight(): Removes whitespace from the end of a string.

String Conversion Methods

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

Locale-Sensitive Methods

localeCompare(compareString): Compares two strings in the current locale.
toLocaleLowerCase(locale): The characters within a string are converted to lowercase while respecting the current locale.
toLocaleUpperCase(locale): The characters within a string are converted to uppercase while respecting the current locale.

String Padding Methods

padStart(targetLength, padString): Pads the current string from the start with a given string until the resulting string reaches the given length.
padEnd(targetLength, padString): Pads the current string from the end with a given string until the resulting string reaches the given length.

Raw String Methods

String.raw(): A tag function of template literals, it returns a string created from a raw template string.

Example Usage

let str = "Hello, World!";

console.log(str.charAt(0)); // "H"
console.log(str.charCodeAt(0)); // 72
console.log(str.concat(" How are you?")); // "Hello, World! How are you?"
console.log(str.includes("World")); // true
console.log(str.endsWith("!")); // true
console.log(str.startsWith("Hello")); // true
console.log(str.indexOf("o")); // 4
console.log(str.lastIndexOf("o")); // 8
console.log(str.match(/o/g)); // ["o", "o"]
console.log(str.replace("World", "Universe")); // "Hello, Universe!"
console.log(str.slice(0, 5)); // "Hello"
console.log(str.split(", ")); // ["Hello", "World!"]
console.log(str.substring(0, 5)); // "Hello"
console.log(str.toLowerCase()); // "hello, world!"
console.log(str.toUpperCase()); // "HELLO, WORLD!"
console.log(str.trim()); // "Hello, World!"
console.log(str.padStart(15, "*")); // "**Hello, World!"
console.log(str.padEnd(15, "*")); // "Hello, World!**"

These methods provide a powerful toolkit for string manipulation and are essential for effective JavaScript programming.

Javascript String methods