JavaScript String Operators

String operators are used to combine or update text (strings) in JavaScript. They make it easy to build messages, labels, or any textual content in your programs.

1. Concatenation (`+`)

The + operator can combine (concatenate) two or more strings into a single string.

Example 1: Basic concatenation

let firstName = 'John';
let lastName = 'Doe';

let fullName = firstName + ' ' + lastName;
console.log(fullName); // Output: "John Doe"

Example 2: String + Number

let result = 'Age: ' + 25;
console.log(result); // Output: "Age: 25"

Example 3: Number + String

let result = 25 + ' years';
console.log(result); // Output: "25 years"

2. Append (`+=`)

The += operator adds a string to an existing string variable, effectively updating it.

Example 1: Appending text

let message = 'Hello';
message += ' World';
console.log(message); // Output: "Hello World"

Example 2: Appending multiple times

let log = 'Start';
log += ' -> Step 1';
log += ' -> Step 2';
console.log(log); // Output: "Start -> Step 1 -> Step 2"

Example 3: Appending numbers

let text = 'Total: ';
text += 100;
console.log(text); // Output: "Total: 100"