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This article mainly describes how js uses logical assignment operators, the text is very detailed, has a certain reference value, interested friends must read!

logical assignment operator

Logical assignment operators are defined by the logical operators &&,||、?? and assignment operator =.

const a = 1;const b = 2;a &&= b;console.log(a); // 2//above equivalent to a && (a = b);//or if (a) { a = b}

Check whether the value of a is true, and if true, update the value of a. Use logical OR|| Operators can do the same thing.

const a = null;const b = 3;a ||= b;console.log(a); // 3//above equivalent to a|| (a = b);

Use null merge operator??:

const a = null;const b = 3;a ??= b;console.log(a); // 3//above equivalent to if (a == null|| a === undefined) { a = b;}

Attention: Operator checks only for null or undefined values.

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