About

toPrecision is a npm module similar to built-in .toPrecision(), but without exponential notation.

toPrecision() VS default .toPrecision():

• without exponential notation (eg 1.23e4)
• Both numbers in string ('123') and numbers (123) are supported.
• optional thousand separator (1,200)
• optional currency symbol ($200)

eg

const pc = require('toprecision')
let v = 12345.678
t = pc(v, 4) // t:12350
t = pc(v, 4, {comma:1})  t:'12,350'
t = pc(v, 4, {k:1})  t:'12.35k'
t = pc(v, 4, {dollar:1})  t:'$12350'
t = pc(v, 4, {prefix:'USD'})  t:'USD12350'

eg2 (ceil, floor, round)

let v = 12345.678
t = pc(v, 4) // t: 12350 // default round
t = pc(v, 4, {type:'ceil'}) // t: 12350
t = pc(v, 4, {ceil:1}) // t: 12350
t = pc(v, 4, {type:'floor'}) // t: 12340
t = pc(v, 4, {floor:1}) // t: 12340

Installation

In terminal (navigate to your project folder first):

npm i toprecision

then in your .js file, include this code to start using:

import toPrecision from "toprecision"

console.log(toPrecision(0.01234, 3)) // output: 0.0123

Parameters

function toPrecision(val, prec, { comma, dollar, prefix })

• value = any number
• precision = integer (1-100)
  • if omitted, toPrecision will return back the value
  • if value is outisde 1-100, error will be emitted
• optional
  • comma/c = bool (true, 1 / false, 0)
    • true / 1: will return string: 1,200
    • false / 0: default value, will return number without separator
  • dollar/d = bool (true, 1 / false, 0)
    • true / 1: return dollar sign ($200)
    • false / 0: default value without dollar sign (200)
  • prefix/pre/p = string
    • eg: € => €200, $ => $200, USD => USD200
    • default value: '' (empty_string)
  • k = bool (true, 1 / false, 0)
    • true / 1: return with k behind if value >= 1000 (1.2k)
      • value >= 1,000,000 (1.2M); value >= 1,000,000,000 (1.2B)
    • false / 0: default value without k (1200)
  • type = 'ceil|floor' // default undefined
  • ceil = 0|1 // default 0; shorthand for type='ceil'
  • floor = 0|1 // default 0; shorthand for type='floor'

return

default return value is string