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This article mainly introduces how js uses the comma operator, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Comma operator

I'm not talking about using comma delimiters to separate objects or elements in containers, such as const arr = [2, 7, 4, 8, 8].

In the expression const a = (2p3), the comma operator allows the entire expression in parentheses to be evaluated, so let's look at some interesting examples:

Basically, this operator executes and & & and | | between the left and right operands at the same time, because it executes the state of both operands.

If you are still confused about its use, think of it this way: it allows you to evaluate multiple expressions where JavaScript expects one expression. This may be to present more elegant code, or to make it easier to debug.

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