javascript nullish
Expression:
Left ?? Right
if left is null or undefined , then Right will be the value
const a = '' ;
const b = undefined;
const c = a ?? 'default' ; // will give c =''
const d = b ?? 'default' ; // wil give d = 'default'
4
9
const nullValue = null;
const emptyText = ""; // falsy
const someNumber = 42;
const valA = nullValue ?? "default for A";
const valB = emptyText ?? "default for B";
const valC = someNumber ?? 0;
console.log(valA); // "default for A"
console.log(valB); // "" (as the empty string is not null or undefined)
console.log(valC); // 42
Thank you!
9
4
(9 Votes)
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