undefined vs. null revisited

This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer

Many programming languages have one “non-value” called null. It indicates that a variable does not currently point to an object – for example, when it hasn’t been initialized yet.

In contrast, JavaScript has two such non-values: undefined and null. In this blog post, we examine how they differ and how to best use or avoid them.

This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer

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