Why javascript Boolean object with false value evaluates to true.
var bln = new Boolean(false);
if (bln) {
alert('true');
} else {
alert('false');
}
Asked
Active
Viewed 188 times
-1
Tushar
- 85,780
- 21
- 159
- 179
Muhammad Nasir
- 2,126
- 4
- 35
- 63
-
1Because every object evaluates to `true`. – Felix Kling Oct 09 '15 at 05:28
-
This is a really good example of why *you should debug with the console*. Logging `bln` to the console would have solved this mystery. – Travis J Oct 09 '15 at 05:30
-
You can use primitive values (`false` instead of `new Boolean(false)`) or use the `valueOf` function: `new Boolean(false).valueOf()`. – Sebastian Simon Oct 09 '15 at 05:32
1 Answers
0
Because new Boolean(false)(typeof new Boolean() == 'object') returns an object, not a primitive value, objects are by default truthy in nature
Arun P Johny
- 384,651
- 66
- 527
- 531
-
can you please provide me alternate solution for the same here http://stackoverflow.com/questions/33013512/dropdown-selected-option-text-issue-css-not-working – user3637224 Oct 09 '15 at 06:11