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Today, I would like to share with you how JavaScript judges the relevant knowledge points of NaN. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

I also came across such a question on FreeCodeCamp:

Deletes all false values in the array.

In JavaScript, false values are false, null, 0, "", undefined, and NaN.

For the judgment of NaN, JS provides the function isNaN (). However, using the isNaN () function can only determine whether the variable is non-numeric, not whether the value of the variable is NaN.

Therefore, apply the nature of NaN:

> NaN = NaN;false / / always return false

We can then use = = to determine whether the variable is NaN. You only need to determine whether the variable is equal to itself, and if not, the value of the variable is NaN.

What is JavaScript? JavaScript is a literal scripting language whose interpreter is called JavaScript engine and is a part of the browser. JavaScript is a scripting language widely used on the client side. It was first used on HTML pages to add dynamic functions to HTML pages.

These are all the contents of the article "how JavaScript judges NaN". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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