js Nullish Coalescing Operator

js Nullish Coalescing Operator

空值合并

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

const u = undefined ?? 'default string';
console.log(u);
// "default string"

const f = false ?? 'default string';
console.log(f);
// false

const nan = NaN ?? 'default string';
console.log(nan);
// NaN

const z = 0 ?? 666;
console.log(z);
// 0

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

refs

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