Sentry Answers>JavaScript>

Equivalent of printf or String.Format in JavaScript

Equivalent of printf or String.Format in JavaScript

David Y.

—

The ProblemJump To Solution

In JavaScript, how can I print strings containing the values of variables? I would use printf() to do this in C or PHP and string.Format() to do this in C# or String.format() in Java. What is the JavaScript equivalent of these functions?

The Solution

Modern JavaScript supports template strings delimited with backticks, which can contain arbitrary JavaScript expressions inside one or more ${} blocks. For example:

Click to Copy
const myNum = 20;
const myString = `The value of myNum is ${myNum}`;
const myString2 = `The value of myNum + 10 is ${myNum + 10}`;

console.log(myString); // will print "The value of myNum is 20"
console.log(myString2); // will print "The value of myNum + 10 is 30"
  • ResourcesImprove Web Browser Performance - Find the JavaScript code causing slowdowns
  • ResourcesJavaScript Frontend Error Monitoring 101
  • Syntax.fm logo
    Listen to the Syntax Podcast

    Tasty Treats for Web Developers brought to you by Sentry. Web development tips and tricks hosted by Wes Bos and Scott Tolinski

    Listen to Syntax

Loved by over 4 million developers and more than 90,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.

learn more about sentryjoin our discord
© 2024 • Sentry is a registered Trademark
of Functional Software, Inc.