JavaScript micro-function to check vars types

main.js

import { is, getType } from './type.js'

const isFields = (fields) => values.every((field) => is(field, 'Object'))  

const getName = (value) => {
  const names = {
    'String': () => value,
    'Number': () => `Number ${value}`,
     'Array': () => `List (${value.join(', ')})`
  }
  return names[getType(value)] || 'None'
}

type.js

/**
 * Get value's type name.
 * @param {*} value
 * @returns {string}
 */
export const getType = (value) => {
  const string = Object.prototype.toString.call(value)
  const [, type ] = /\[object (\w*)\]/.exec(string)
  return type
}

/**
 * Check if value's type is type (argument).
 * @param {*} value
 * @param {string} type
 * @returns {boolean}
 */
export const is = (value, type) => getType(value) === type