JS using short-circuit principle shorthand if statement

Look at the source code of Googledoodle-dance, learn a little knowledge-shorthand if statement.

In almost all languages | | and && Follow the principle of "short circuit", such as the first expression in && is false to not handle the second expression, and | | Just the opposite.

JS also follows the above principles. All:

A && B: Converts A, B to Boolean, then logical with, True returns B, False returns a
A | | B: Converts A, B to Boolean, then logical OR, True returns a, FALSE returns B

So the IF statement is similar to this:

if (2>1) {

A=1;

}

We can simply write:

2>1&& (a=1)

Original: http://jayuh.com/js-short-circuit/