null vs. undefined in JavaScript

null vs. undefined in JavaScript

JavaScript has 2 such non-values: null and undefined. In this tutorial, we are going to examine how they vary and how to best use or avoid them.

Numerous programming languages have one “non-value” called null. It tells that a variable doesn’t currently point to an object — e.g, when it hasn’t been initialized yet.

On the other hand, JavaScript has 2 such non-values: null and undefined. In this article, we are going to examine how they vary and how to best use or avoid them.

  • null vs undefined
  • Occurrences of undefined in the language
  • Occurrences of null in the language
  • Operators that treat undefined and/or null specially
  • Handling null and undefined
  • Either null or undefined is a “switched off” value

programming javascript web-development

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