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Check a value and return true for null or undefined
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| // Exclude zero (0) which is typically falsy | |
| let isEmpty = (x) => x == 0 ? false : !(x) | |
| /* Tests (run in Node CLI) | |
| > isEmpty(0) | |
| false | |
| > isEmpty(1) | |
| false | |
| > isEmpty(1.5) | |
| false | |
| > isEmpty(true) | |
| false | |
| > isEmpty(false) | |
| false | |
| > isEmpty('hi') | |
| false | |
| > isEmpty(null) | |
| true | |
| > isEmpty(undefined) | |
| true | |
| */ |
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