mathjs/src/function/string/baseUtils.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

import { factory } from '../../utils/factory'
import { isInteger } from '../../utils/number'

function baseFormatter (base) {
  const prefixes = { 2: '0b', 8: '0o', 16: '0x' }
  const prefix = prefixes[base]
  return function (n) {
    if (n > 2 ** 31 - 1 || n < -(2 ** 31)) {
      throw new Error('Value must be in range [-2^31, 2^31-1]')
    }
    if (!isInteger(n)) {
      throw new Error('Value must be an integer')
    }
    if (n < 0) {
      n = n + 2 ** 32
    }
    return `${prefix}${n.toString(base)}`
  }
}

const dependencies = ['typed']

export function createBaseFormatterFactory (name, base) {
  return factory(name, dependencies, ({ typed }) => {
    return typed(name, {
      number: baseFormatter(base)
    })
  })
}