Appending Variables to Strings in JavaScript

In JavaScript, you can use the + operator to concatenate (combine) two strings. You can also use template literals, which are strings that are enclosed in backticks (`), to create a string that includes variables.

Here’s an example of using the + operator to concatenate two strings:

let greeting = 'Hello';
let name = 'Alice';

let message = greeting + ', ' + name + '!';

console.log(message);  // Output: "Hello, Alice!"

Here’s an example of using template literals to include a variable in a string:

let greeting = 'Hello';
let name = 'Alice';

let message = `${greeting}, ${name}!`;

console.log(message);  // Output: "Hello, Alice!"

Template literals can also include expressions, which are evaluated and then included in the string. Here’s an example:

let x = 10;
let y = 20;

let message = `The sum of x and y is ${x + y}.`;

console.log(message);  // Output: "The sum of x and y is 30."

In this case, the expression x + y is evaluated to 30, and the resulting value is included in the string.

Here are a few more things to know about using variables in strings in JavaScript:

• If you want to include a single quote (‘) or double quote (“) in a string that is surrounded by single quotes (‘) or double quotes (“), respectively, you can use the backslash () escape character to include the quote in the string. For example:

let message1 = 'Alice said, "I love JavaScript!"';
let message2 = "Alice said, 'I love JavaScript!'";

• If you want to include a backslash () in a string, you can use two backslashes (\) to represent a single backslash. For example:

let message = "This is a backslash: \\";

• If you want to include a newline in a string, you can use the newline escape sequence (\n). For example:

let message = "This is a string\nthat spans multiple lines.";