O'Reilly logo

JavaScript: The Good Parts by Douglas Crockford

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

void

In many languages, void is a type that has no values. In JavaScript, void is an operator that takes an operand and returns undefined. This is not useful, and it is very confusing. Avoid void.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required