kind-of/index.js

var toString = Object.prototype.toString;

/**
 * Get the native `typeof` a value.
 *
 * @param  {*} `val`
 * @return {*} Native javascript type
 */

module.exports = function kindOf(val) {
  var type = typeof val;

  // primitivies
  if (type === 'undefined') {
    return 'undefined';
  }
  if (val === null) {
    return 'null';
  }
  if (val === true || val === false || val instanceof Boolean) {
    return 'boolean';
  }
  if (type === 'string' || val instanceof String) {
    return 'string';
  }
  if (type === 'number' || val instanceof Number) {
    return 'number';
  }

  // functions
  if (type === 'function' || val instanceof Function) {
    if (typeof val.constructor.name !== 'undefined' && val.constructor.name.slice(0, 9) === 'Generator') {
      return 'generatorfunction';
    }
    return 'function';
  }

  // array
  if (typeof Array.isArray !== 'undefined' && Array.isArray(val)) {
    return 'array';
  }

  // check for instances of RegExp and Date before calling `toString`
  if (val instanceof RegExp) {
    return 'regexp';
  }
  if (val instanceof Date) {
    return 'date';
  }

  // other objects
  type = toString.call(val);

  if (type === '[object RegExp]') {
    return 'regexp';
  }
  if (type === '[object Date]') {
    return 'date';
  }
  if (type === '[object Arguments]') {
    return 'arguments';
  }
  if (type === '[object Error]') {
    return 'error';
  }
  if (type === '[object Promise]') {
    return 'promise';
  }

  // buffer
  if (isBuffer(val)) {
    return 'buffer';
  }

  // es6: Map, WeakMap, Set, WeakSet
  if (type === '[object Set]') {
    return 'set';
  }
  if (type === '[object WeakSet]') {
    return 'weakset';
  }
  if (type === '[object Map]') {
    return 'map';
  }
  if (type === '[object WeakMap]') {
    return 'weakmap';
  }
  if (type === '[object Symbol]') {
    return 'symbol';
  }
  
  if (type === '[object Map Iterator]') {
    return 'mapiterator';
  }
  if (type === '[object Set Iterator]') {
    return 'setiterator';
  }
  if (type === '[object String Iterator]') {
    return 'stringiterator';
  }
  if (type === '[object Array Iterator]') {
    return 'arrayiterator';
  }
  
  // typed arrays
  if (type === '[object Int8Array]') {
    return 'int8array';
  }
  if (type === '[object Uint8Array]') {
    return 'uint8array';
  }
  if (type === '[object Uint8ClampedArray]') {
    return 'uint8clampedarray';
  }
  if (type === '[object Int16Array]') {
    return 'int16array';
  }
  if (type === '[object Uint16Array]') {
    return 'uint16array';
  }
  if (type === '[object Int32Array]') {
    return 'int32array';
  }
  if (type === '[object Uint32Array]') {
    return 'uint32array';
  }
  if (type === '[object Float32Array]') {
    return 'float32array';
  }
  if (type === '[object Float64Array]') {
    return 'float64array';
  }

  // must be a plain object
  return 'object';
};

/**
 * If you need to support Safari 5-7 (8-10 yr-old browser),
 * take a look at https://github.com/feross/is-buffer
 */

function isBuffer(val) {
  return val.constructor
    && typeof val.constructor.isBuffer === 'function'
    && val.constructor.isBuffer(val);
}