double question mark javascript
//Similar to || but only returns the right-hand operand if the left-hand is null or undefined
0 ?? "other" // 0
false ?? "other" // false
null ?? "other" // "other"
undefined ?? "other" // "other"double question mark javascript
//Similar to || but only returns the right-hand operand if the left-hand is null or undefined
0 ?? "other" // 0
false ?? "other" // false
null ?? "other" // "other"
undefined ?? "other" // "other"javascript double question mark
let a = null;
const b = a ?? -1; // Same as b = ( a != null ? a : -1 );
console.log(b); // output: -1
//OR IF
let a = 9;
const b = a ?? -1;
console.log(b); // output: 9
//PS.,VERY CLOSE TO '||' OPERATION IN FUNCTION, BY NOT THE SAMElogical nullish operator javascript
function config(options) {
options.duration ??= 100;
options.speed ??= 25;
return options;
}
config({ duration: 125 }); // { duration: 125, speed: 25 }
config({}); // { duration: 100, speed: 25 }Copyright © 2021 Codeinu
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