lodash/lang/isArguments.js

import isLength from '../internal/isLength';
import isObjectLike from '../internal/isObjectLike';

/** `Object#toString` result references. */
var argsTag = '[object Arguments]';

/** Used for native method references. */
var objectProto = Object.prototype;

/**
 * Used to resolve the `toStringTag` of values.
 * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
 * for more details.
 */
var objToString = objectProto.toString;

/**
 * Checks if `value` is classified as an `arguments` object.
 *
 * @static
 * @memberOf _
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
 * @example
 *
 * (function() { return _.isArguments(arguments); })();
 * // => true
 *
 * _.isArguments([1, 2, 3]);
 * // => false
 */
function isArguments(value) {
  var length = isObjectLike(value) ? value.length : undefined;
  return (isLength(length) && objToString.call(value) == argsTag) || false;
}

export default isArguments;