Understand NaN in JavaScript

Understand NaN in JavaScript

NaN, denoting "Not A Number", is a special number in JavaScript created after a faulty operation on numbers.

While working directly with NaN is rare, it can appear surprisingly after a failed operation on numbers.

Let’s take a closer look at NaN special value: how to check if a variable has NaN, and importantly understand the scenarios that create “Not A Number” values.

javascript number nan

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Checking for NaN in JavaScript

NaN, in JavaScript, can be many things. In fact, it can be almost anything, so long as it is Not a Number. Its type is technically “number” (when evaluated with “typeof”), although it stands for Not a Number. Values can become NaN through a variety of means, which usually involve erroneous math calculations (such as 0/0), or as a result of type coercion, either implicit or explicit.