Number (helping-js/core/number)

Random numbers, clamping, and left string padding. No dependencies.

Imports

import {
  randInt,
  randChoice,
  between,
  notLessThan,
  notGreaterThan,
  strPad,
} from 'helping-js/core/number'

API

Function	Role
randInt(min, max)	Inclusive random integer
randChoice(arr)	Random element from a non-empty array
between(n, min, max)	Clamp n to [min, max]
notLessThan(n, min)	Math.max(n, min)
notGreaterThan(n, max)	Math.min(n, max)
strPad(str, length, padChar?)	Left-pad with padChar (default space) until length

Samples

IDs and scores

const id = randInt(1000, 9999)
const pick = randChoice(['a', 'b', 'c'])
const pct = between(Number(userInput), 0, 100)

Display

strPad(7, 3, '0') // '007'
strPad('x', 4, '-') // '---x'

Vue: random pick in setup

import { randChoice } from 'helping-js/core/number'

const quotes = ['a', 'b', 'c']
const daily = randChoice(quotes)

Express: clamp pagination

import { between } from 'helping-js/core/number'

const page = between(parseInt(req.query.page, 10) || 1, 1, 1000)

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