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Boolean casting in Node.js
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| > !!(false) | |
| false | |
| > !!(0) | |
| false | |
| > !!("") | |
| false | |
| > !!(null) | |
| false | |
| > !!(undefined) | |
| false | |
| > !!("0") | |
| true | |
| > !!("test") | |
| true | |
| > !!(-1) | |
| true | |
| > !!(true) | |
| true |
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