phaser/src/tweens/builders/GetNewValue.js

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2018 Photon Storm Ltd.
 * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
 */

/**
 * [description]
 *
 * @function Phaser.Tweens.Builders.GetNewValue
 * @since 3.0.0
 *
 * @param {object} source - [description]
 * @param {string} key - [description]
 * @param {*} defaultValue - [description]
 *
 * @return {function} [description]
 */
var GetNewValue = function (source, key, defaultValue)
{
    var valueCallback;

    if (source.hasOwnProperty(key))
    {
        var t = typeof(source[key]);

        if (t === 'function')
        {
            valueCallback = function (index, totalTargets, target)
            {
                return source[key](index, totalTargets, target);
            };
        }
        else
        {
            valueCallback = function ()
            {
                return source[key];
            };
        }
    }
    else if (typeof defaultValue === 'function')
    {
        valueCallback = defaultValue;
    }
    else
    {
        valueCallback = function ()
        {
            return defaultValue;
        };
    }

    return valueCallback;
};

module.exports = GetNewValue;