How to Create a String with Variables in JavaScript?

Last Updated : 12 Nov, 2024

To create a string with variables in JavaScript, you can use several methods, including string concatenation, template literals, and the String methods. Here are the common approaches:

1. Template Literals (Recommended)

Template literals are the modern and most preferred way to create strings with variables. They use backticks (`) and allow embedded expressions using ${} syntax.

Example:

JavaScript

const name = "Alice"; const age = 30; const message = `Hello, my name is ${name} and I am ${age} years old.`; console.log(message); // Output: Hello, my name is Alice and I am 30 years old.

Output

Hello, my name is Alice and I am 30 years old.

2. String Concatenation Using the `+` Operator

This is the traditional way to build strings by concatenating string literals and variables using the + operator.

Example:

JavaScript

const name = "Bob"; const age = 25; const message = "Hello, my name is " + name + " and I am " + age + " years old."; console.log(message); // Output: Hello, my name is Bob and I am 25 years old.

Output

Hello, my name is Bob and I am 25 years old.

3. Using the `String.concat()` Method

You can also use the String.concat() method to join strings and variables. This method is less commonly used for simple string construction but can be handy in some situations.

Example:

JavaScript

const firstName = "Charlie"; const lastName = "Brown"; const fullName = "".concat(firstName, " ", lastName); console.log(fullName); // Output: Charlie Brown

Output

Charlie Brown

4. Using String Interpolation Functions (Older Methods)

In the past, developers used functions like sprintf() from libraries, but these are largely obsolete due to the simplicity of template literals.

Which Method to Use?

Template literals (backticks and ${} syntax) are recommended for creating strings with variables because they are more readable, support multi-line strings, and make it easy to include expressions and complex formatting.
Concatenation is fine for simpler cases but can get messy for longer strings.

Example Comparison

JavaScript

const item = "laptop"; const price = 999.99;  // Using template literals (Recommended) const msg1 = `The price of the ${item} is $${price}.`;  // Using string concatenation const msg2 = "The price of the " + item + " is $" + price + ".";  console.log(msg1); // Output: The price of the laptop is $999.99. console.log(msg2); // Output: The price of the laptop is $999.99.

Output

The price of the laptop is $999.99. The price of the laptop is $999.99.

How to Create JSON String in JavaScript?

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How to Create a String with Variables in JavaScript?

1. Template Literals (Recommended)

Example:

2. String Concatenation Using the + Operator

Example:

3. Using the String.concat() Method

Example:

4. Using String Interpolation Functions (Older Methods)

Which Method to Use?

Example Comparison

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