Nullish coalescing operator: printing 0 where || gives -1

2022.10.171 min readTech notesMoved from my Tistory blogRead the Korean original

Values that count as false: 0, -0, ''

1
2
3
4
5
6
7
8let number =0
console.log(number || '-1'); //0 is treated as false, so -1 is printed

// prints -1


console.log(number ?? '-1');
// prints 0

As above, when you want to print 0, use the Nullish Coalescing Operator

#Nullish Coalescing Operator
#JavaScript

More in Tech notes

Browser storage (local storage, session storage, cookies)

What this refers to in JavaScript: functions, methods, and new

Event bubbling