How to check javascript number range?

Question

How following if condition true for ids=1

var ids = 1;

if (9 <= ids <= 14) {

  console.log(9 <= ids <= 14)

}

I want it to be true only if the value of ids between 9 and 14. Appreciate any help understanding how JavaScript operators work when checking range.

score 5 · Accepted Answer · answered Nov 08 '17 at 14:11

5

You can't chain comparison operators like that. You have to do each comparison separately and use AND (&&) or OR (||).

var ids = 1;
if (9 <= ids && ids <= 14) {}

answered Nov 08 '17 at 14:11

ATOMP

1,311
10
29

score 3 · Answer 2 · answered Nov 08 '17 at 14:12

You need to check with two conditions and one logical AND, because the first condition returns a boolean value and this is compared with the other value.

var ids = 1;

if (9 <= ids && ids <= 14) {
    console.log('in range');
} else {
    console.log('not in range');
}

How to check javascript number range?

2 Answers2