How to use | | and & & in js

This article will explain in detail how to use | and & & in js. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

| the ingenious use of and & &

/ / scene 1function b (a) {if (a) {return a} else {return'}} / / scene 2function b (a) {return a | |''}

The above is the use of |, also known as short-circuit handling. It is common in if conditions, but it can also be used directly in statements. When the first parameter is true, it takes the value of the first parameter, and when the first parameter is not true, it takes the value of the second parameter. & & is exactly the opposite of |. The first parameter is true, which takes the value of the second parameter.

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