.round, .ceil, .floor with precision parameter: .round(1.234, 2) → 1.23
npm install math-precision> .round, .ceil, .floor with precision parameter. E.g. .round(1.234, 2) → 1.23
This node.js package gives you a cleaner way to round numbers using precision
. It's simple, lightweight and it relies entirely on JS Math functions.
It has no dependencies and it works on any node.js version.
It's a pity not to use it! :)
All world wide web documentation about decimal rounding in JavaScript,
including Mozilla Docs
lead us to this solution:
E.g. To round 1.2347 with precision 3 you should call: Math.round(1.2347 * 1000) / 1000 // = 1.235
which is what this package actually does behind the scenes if you call: .round(1.2347, 3) (check the source code)
The options are: to write an ugly code, to create a function and copy/paste it
everywhere, to export the function from your own utility library or to
require this package ... _you choose!_ :)
Anyway there are several npm packages which does the same thing but I find
this the straightforward way to do it.
> It also de deals with negative precision
> .round(1234, -2) = 1200
>
> See other examples or run the tests
``sh`
$ npm install math-precision
`js
var round = require('math-precision').round
console.log(round(1.2347, 2)) // 1.23
console.log(round(1.235, 2)) // 1.24
console.log(round(1.2, 2)) // 1.2
console.log(round(1.24569, 3)) // 1.246
console.log(round(1234, -2)) // 1200
console.log(round(12785.9, -3)) // 13000
console.log(round(1.2347)) // 1
console.log(round(1.2347, NaN)) // 1
console.log(round(undefined, 2)) // NaN
console.log(round(NaN, 2)) // NaN
`
`js
var ceil = require('math-precision').ceil
console.log(ceil(1.2347, 2)) // 1.24
console.log(ceil(1.2, 2)) // 1.2
console.log(ceil(1.2341, 3)) // 1.235
console.log(ceil(1234, -2)) // 1300
console.log(ceil(123436.87, -3)) // 124000
console.log(ceil(1.2347)) // 2
console.log(ceil(1.2347, NaN)) // 2
console.log(ceil(undefined, 2)) // NaN
console.log(ceil(NaN, 2)) // NaN
`
`js
var floor = require('math-precision').floor
console.log(floor(1.2361, 2)) // 1.23
console.log(floor(1.2367, 3)) // 1.236
console.log(floor(1.8, 2)) // 1.8
console.log(floor(1876, -2)) // 1800
console.log(floor(187697.78, -3)) // 187000
console.log(floor(1.2361)) // 1
console.log(floor(1.2361, NaN)) // 1
console.log(floor(undefined, 2)) // NaN
console.log(floor(NaN, 2)) // NaN
`
`js
var math = require('math-precision')
console.log(math.round(1.2358, 2)) // 1.24
console.log(math.ceil(1.2358, 2)) // 1.24
console.log(math.floor(1.2358, 2)) // 1.23
`
Simply clone the repo, npm install, and run npm test`
#### MIT