Returns the length of a string.
let str = "Hello, World!";
// The length property returns the number of characters in the string
console.log(str.length); // Output: 13
Converts a string to uppercase letters.
let str = "Hello, World!";
// The toUpperCase() method converts all characters in the string to uppercase
console.log(str.toUpperCase()); // Output: HELLO, WORLD!
Checks if a string contains a specified value.
let str = "Hello, World!";
// The includes() method checks if the string contains the specified substring
console.log(str.includes("World")); // Output: true
Extracts a part of a string and returns it as a new string.
let str = "Hello, World!";
// The slice() method extracts a section of the string from index 0 to 5
console.log(str.slice(0, 5)); // Output: Hello
Pads the current string with another string (multiple times, if needed) until the resulting string reaches the given length.
let str = "5";
// The padStart() method pads the string with "0" until the length is 3
console.log(str.padStart(3, "0")); // Output: 005
Returns a new string with a specified number of copies of an existing string.
let str = "Hello";
// The repeat() method repeats the string 3 times
console.log(str.repeat(3)); // Output: HelloHelloHello