"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = isCollection;

var _symbols = require("../polyfills/symbols");

function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

/**
 * Returns true if the provided object is an Object (i.e. not a string literal)
 * and is either Iterable or Array-like.
 *
 * This may be used in place of [Array.isArray()][isArray] to determine if an
 * object should be iterated-over. It always excludes string literals and
 * includes Arrays (regardless of if it is Iterable). It also includes other
 * Array-like objects such as NodeList, TypedArray, and Buffer.
 *
 * @example
 *
 * isCollection([ 1, 2, 3 ]) // true
 * isCollection('ABC') // false
 * isCollection({ length: 1, 0: 'Alpha' }) // true
 * isCollection({ key: 'value' }) // false
 * isCollection(new Map()) // true
 *
 * @param obj
 *   An Object value which might implement the Iterable or Array-like protocols.
 * @return {boolean} true if Iterable or Array-like Object.
 */
function isCollection(obj) {
  if (obj == null || _typeof(obj) !== 'object') {
    return false;
  } // Is Array like?


  var length = obj.length;

  if (typeof length === 'number' && length >= 0 && length % 1 === 0) {
    return true;
  } // Is Iterable?


  return typeof obj[_symbols.SYMBOL_ITERATOR] === 'function';
}