phaser/src/utils/array/CountAllMatching.js

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2019 Photon Storm Ltd.
 * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
 */

var SafeRange = require('./SafeRange');

/**
 * Returns the total number of elements in the array which have a property matching the given value.
 *
 * @function Phaser.Utils.Array.CountAllMatching
 * @since 3.4.0
 *
 * @param {array} array - The array to search.
 * @param {string} property - The property to test on each array element.
 * @param {*} value - The value to test the property against. Must pass a strict (`===`) comparison check.
 * @param {integer} [startIndex] - An optional start index to search from.
 * @param {integer} [endIndex] - An optional end index to search to.
 *
 * @return {integer} The total number of elements with properties matching the given value.
 */
var CountAllMatching = function (array, property, value, startIndex, endIndex)
{
    if (startIndex === undefined) { startIndex = 0; }
    if (endIndex === undefined) { endIndex = array.length; }

    var total = 0;

    if (SafeRange(array, startIndex, endIndex))
    {
        for (var i = startIndex; i < endIndex; i++)
        {
            var child = array[i];

            if (child[property] === value)
            {
                total++;
            }
        }
    }

    return total;
};

module.exports = CountAllMatching;