js logical operation All In One

js logical operation All In One

js 逻辑运算

Logical AND (&&)
Logical AND assignment (&&=)
Logical OR (||)
Logical OR assignment (||=)
Logical NOT (!)
Logical nullish assignment (??=)

Logical AND (&&)

逻辑与

Logical OR (||)

逻辑或

const a = 3;
const b = -2;

console.log(a > 0 || b > 0);
// expected output: true

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR

Logical NOT (!)

逻辑非

Logical nullish assignment (??=)

逻辑空值合并

const foo = null ?? 'default string';
console.log(foo);
// "default string"

const baz = 0 ?? 42;
console.log(baz);
// 0

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator

ES 2020

nullish coalescing operator (??)

空值合并操作符

refs

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