devextreme/dist/transpiled/core/utils/extend.js

HTML5 JavaScript Component Suite for Responsive Web Development

"use strict";

var isPlainObject = require("./type").isPlainObject;

var extendFromObject = function extendFromObject(target, source, overrideExistingValues) {
    target = target || {};
    for (var prop in source) {
        if (source.hasOwnProperty(prop)) {
            var value = source[prop];
            if (!(prop in target) || overrideExistingValues) {
                target[prop] = value;
            }
        }
    }
    return target;
};

var extend = function extend(target) {
    target = target || {};

    var i = 1,
        deep = false;

    if (typeof target === "boolean") {
        deep = target;
        target = arguments[1] || {};
        i++;
    }

    for (; i < arguments.length; i++) {
        var source = arguments[i];
        if (source == null) {
            continue;
        }

        for (var key in source) {
            var targetValue = target[key],
                sourceValue = source[key],
                sourceValueIsArray = false,
                clone;

            if (target === sourceValue) {
                continue;
            }

            if (deep && sourceValue && (isPlainObject(sourceValue) || (sourceValueIsArray = Array.isArray(sourceValue)))) {

                if (sourceValueIsArray) {
                    clone = targetValue && Array.isArray(targetValue) ? targetValue : [];
                } else {
                    clone = targetValue && isPlainObject(targetValue) ? targetValue : {};
                }

                target[key] = extend(deep, clone, sourceValue);
            } else if (sourceValue !== undefined) {
                target[key] = sourceValue;
            }
        }
    }

    return target;
};

exports.extend = extend;
exports.extendFromObject = extendFromObject;