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.

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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"