Get JavaScript data type

get-data-type.js

/**
 * Get data type
 * @see {@link https://gomakethings.com/a-better-way-to-create-an-immutable-copy-of-an-array-or-object-with-vanilla-js/}
 *
 * @param {} item Thing we want the type of
 * @returns {String} Thing's type
 */
function getDataType (item) {
  /**
   * Unfortunately, `typeof` isn't that useful to detect types like `array`
   * or `null`. This great workaround by Chris Ferdinandi greatly simplifies
   * type checking by removing the need for a lot of chained conditionals
   * (eg. `Array.isArray(item)` and `item === null`).
   */
  return Object.prototype.toString.call(item)
    .slice(8, -1)
    .toLowerCase()
}