JavaScript Type Conversion Table

Question

I have a question about type conversions. Given the following table from w3schools.com...

table of conversions

Why are the strings "0" and "000" converted to boolean true?

@T.J.Crowder - it is. but I can't find a single canonical SO answer for it. — shotor, Aug 02 '17 at 14:07
I think the confusion here comes from sillyness like `"0" == false => true`, while `if ("0") { alert('!!') } => alerts` — user229044, Aug 02 '17 at 14:10

score 1 · Answer 1 · answered Aug 02 '17 at 14:06

1

Because when you coerce a value to boolean in JavaScript, any non-blank string is true. Only blank strings are false.

answered Aug 02 '17 at 14:06

T.J. Crowder

Thanks very much ... its already clear for me ... Just one ... I cant understand why people in stackoverflow minuses my question (-) ... yes may be this is a duplicate , but i am a beginner and i couldnt find the answer ... – Norayr Ghukasyan Aug 02 '17 at 14:12
@NorayrGhukasyan: I can't say, I didn't downvote your question. But the most likely reason would be the first part of what it says on the downvote button: "...does not show any research effort..." The rules for JavaScript type coercion are **extremely** well-covered in lots of places on the web. – T.J. Crowder Aug 02 '17 at 14:14

score 0 · Answer 2 · answered Aug 02 '17 at 14:06

0

The reason of it is because both "0" and "000" are strings and not numbers.

Any string which is non-empty converted to boolean is going to be true.

answered Aug 02 '17 at 14:06

RottenCheese

Thanks very much ... its already clear for me ... Just one ... I cant understand why people in stackoverflow minuses my question (-) ... yes may be this is a duplicate , but i am a beginner and i couldnt find the answer ... – Norayr Ghukasyan Aug 02 '17 at 14:12

2 Answers2