https://github.com/mablay/metric-prefix

Format numbers using only significant digits and a metric prefix.
https://github.com/mablay/metric-prefix

format metric prefix si unit

Last synced: over 1 year ago
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Format numbers using only significant digits and a metric prefix.

• Host: GitHub
• URL: https://github.com/mablay/metric-prefix
• Owner: mablay
• Created: 2018-09-28T05:18:45.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-06-16T21:38:52.000Z (almost 2 years ago)
• Last Synced: 2025-01-04T13:06:57.983Z (over 1 year ago)
• Topics: format, metric, prefix, si, unit
• Language: JavaScript
• Homepage: https://mablay.github.io/metric-prefix/
• Size: 70.3 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

          
# Metric Prefix

Format numbers using only significant digits and a [metric prefix](https://en.wikipedia.org/wiki/Metric_prefix).  

    prefix(1234567890)

    // => '1.23 G'

## Install

    npm i metric-prefix

#### basic example

    const { prefix } = require('metric-prefix')

    prefix(0.123456789)

    // => '123 m'

#### with options

    prefix(123456, { unit: 'Hz' })

    // => '123 kHz'

    prefix(123456, { delimiter: '' })

    // => '123k'

    prefix(123.456, { precision: 4 })

    // => '123.4'

#### cure bulky options with factory pattern

    const prefix = require('metric-prefix')({

      unit: 'W',

      precision: 4,

      delimiter: ''

    })

    prefix(0.0321) // => '32.10mW'

#### supported value types

Due to [big.js](https://github.com/MikeMcl/big.js)

being used internally, all compatible data types can

be used.

    prefix("100000000000000000000000000")

    // => 100 Y

    prefix(Big(1e26))

    // => 100 Y

## Additional Notes

#### Range

Numbers from 1e-33 to 1e35 can be prefixed. Including non standard prefixes *X*, *W*, *V*. Beyond that a `?` will replace the prefix.

#### Rounding

Prefix *floors* positive and *ceils* negative numbers.

#### Floating Point Arithmetic

In JavaScripts you might encounter situations like

    0.3 - 0.1 = 0.19999999999999998

that lead to

    prefix(0.3 - 0.1) // => '199 m'

and can be fixed with

    prefix(Big(0.3).minus(0.1)) // => '200 m'