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functions javascript round numbers
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| function round(n, e) { | |
| const f = e === 0 ? 1 : Math.pow(10, e); | |
| return Math.round(n * f) / f; | |
| } | |
| // test examples | |
| /* | |
| > round(123.123, 2) | |
| < 123.12 | |
| > round(123.123, 1) | |
| < 123.1 | |
| > round(123.123, 0) | |
| < 123 | |
| > round(123.123, 2) | |
| < 123.12 | |
| > round(123.123, -2) | |
| < 100 | |
| > round(123.123, -1) | |
| < 120 | |
| */ |
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