walker
walker
Programming language:Javascript
2021-05-25 04:59:32
0
Q:

javascript double question mark

pjc50
pjc50
Code: Javascript
2021-05-19 13:53:24 
//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"
4
David May
David May
Code: Javascript
2021-01-24 20:21:52 
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 SAME
2

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