"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var is_1 = require("../is");
var toLength_1 = require("../cast/toLength");
/**
 * @desc returns .length, .size, or a number with the length from `for in` hasOwn
 * @name size
 * @memberOf util
 * @since 5.0.0-beta.6
 * @version 6.0.0-beta.2
 *
 * @param  x value to check length | size
 * @return size
 *
 * {@link http://whereswalden.com/2010/04/06/more-changes-coming-to-spidermonkey-the-magical-__count__-property-of-objects-is-being-removed/ spidermonkey__count__}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/size mozilla-map-size}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/size mozilla-set-size}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length mozilla-function-length}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length mozilla-array-length}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments/length mozilla-arguments-length}
 * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length mozilla-string-length}
 * {@link https://github.com/jashkenas/underscore/blob/master/underscore.js#L476 underscore-size}
 * {@link https://github.com/lodash/lodash/blob/master/size.js lodash-size}
 * {@link https://stackoverflow.com/questions/31014793/is-lodash-size-faster-than-js-length-property stack-overflow-size}
 * @see {@link spidermonkey__count__}
 * @see {@link underscore-size}
 * @see {@link stack-overflow-size}
 * @see {@link lodash-size}
 * @see {@link mozilla-string-length}
 * @see {@link mozilla-array-length}
 * @see {@link mozilla-arguments-length}
 * @see {@link mozilla-function-length}
 * @see {@link mozilla-set-size}
 * @see {@link mozilla-map-size}
 *
 * @example
 *    size(new Set([0, 1]))                     //=> 2
 *    size(new Map(Object.entries({eh: true}))) //=> 1
 *    size({eh: 0})                             //=> 1
 *    size({})                                  //=> 0
 *    size([])                                  //=> 0
 *    size([0, 1, 2])                           //=> 3
 *    size(($1, $2) => {})                      //=> 2
 *    size(() => {})                            //=> 0
 *    size(null)                                //=> 0
 */
function size(x) {
    // --- safety all around
    // decision tree, but sadly, bigger size :,-(
    if (is_1.isNil(x)) {
        return 0;
    }
    // @NOTE could put `isPrimitive` after the length and size checks...
    // but not really needed because look at `toNumber` & +false = 0 etc so
    else if (is_1.isNumberPrimitive(x)) {
        return toLength_1.default(x);
    }
    // --- main checks .length, .size, or for-in
    else if (is_1.hasIn(x, 'length')) {
        return x.length;
    }
    else if (is_1.hasIn(x, 'size')) {
        return x.size;
    }
    else {
        var count = 0;
        for (var property in x) {
            is_1.hasOwnProperty(x, property) && ++count;
        }
        return count;
    }
}
exports.default = size;
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