How to get following inputs to bellow outputs
Input
1.0789
10.350
1.7777
Output
1.07
10.35
1.77
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29
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`after=Math.floor(before*100)/100` – Ultimater Dec 21 '16 at 09:31
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1`1.7777` to `1.77` is NOT round down. It's truncation. Is truncation what you really need? – Álvaro González Dec 21 '16 at 09:32
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1This is not a duplication of the linked question. It specifically asks about rounding *down*, whereas the linked question covers rounding *off*. – Adam Spiers Feb 16 '22 at 19:14
2 Answers
73
Use Math.floor to round the decimal places under the current value.
Example
Math.floor(1.0789 * 100) / 100
Working Fiddle
console.log(Math.floor(1.0789 * 100) / 100);
console.log(Math.floor(10.350 * 100) / 100);
console.log(Math.floor(1.7777 * 100) / 100);
console.log(Math.floor(12.34 * 100) / 100);
Nitheesh
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3This does not work for values like 12.34 which are already 2 decimal places. 12.34 will turn into 12.33. A better solution `function floorDecimals(value, decimals) { return Number(Math.floor(value+'e'+decimals)+'e-'+decimals); }` Credit goes to here http://www.jacklmoore.com/notes/rounding-in-javascript/ – Sean Tomlins May 15 '18 at 23:31
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1@SeanTomlins The simple solution with multiply / divide seems to work for flooring and ceiling in Chrome and Firefox, for me at least. – vgel Jul 23 '20 at 19:39
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@FiddleFreak Typescript compiles to javascript, why will it not work? – Sean Tomlins Nov 23 '21 at 00:58
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@SeanTomlins `Math.floor(3.29012 + 'e' + 3)` typescript error - "Argument of type 'string' is not assignable to parameter of type 'number'." – Fiddle Freak Nov 23 '21 at 21:10
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@SeanTomlins Are you sure that this solution breaks for value `12.34`. I tested this solution with latest chrome, edge and IE. It still works as expected for me. – Nitheesh Nov 24 '21 at 03:39
0
you have several methods for do this
- Use Math.round(num * 100) / 100
- Use Math.ceil(num * 100)/100;
ADH - THE TECHIE GUY
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4The 3 methods you propose are rounding the decimals up. But the question was how to round them down. – zed Nov 21 '20 at 12:39
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