import defaultValue from './defaultValue.js';
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import defined from './defined.js';
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/**
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* Merges two objects, copying their properties onto a new combined object. When two objects have the same
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* property, the value of the property on the first object is used. If either object is undefined,
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* it will be treated as an empty object.
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*
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* @example
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* var object1 = {
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* propOne : 1,
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* propTwo : {
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* value1 : 10
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* }
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* }
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* var object2 = {
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* propTwo : 2
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* }
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* var final = Cesium.combine(object1, object2);
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*
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* // final === {
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* // propOne : 1,
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* // propTwo : {
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* // value1 : 10
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* // }
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* // }
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*
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* @param {Object} [object1] The first object to merge.
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* @param {Object} [object2] The second object to merge.
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* @param {Boolean} [deep=false] Perform a recursive merge.
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* @returns {Object} The combined object containing all properties from both objects.
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*
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* @exports combine
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*/
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function combine(object1, object2, deep) {
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deep = defaultValue(deep, false);
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var result = {};
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var object1Defined = defined(object1);
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var object2Defined = defined(object2);
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var property;
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var object1Value;
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var object2Value;
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if (object1Defined) {
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for (property in object1) {
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if (object1.hasOwnProperty(property)) {
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object1Value = object1[property];
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if (object2Defined && deep && typeof object1Value === 'object' && object2.hasOwnProperty(property)) {
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object2Value = object2[property];
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if (typeof object2Value === 'object') {
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result[property] = combine(object1Value, object2Value, deep);
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} else {
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result[property] = object1Value;
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}
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} else {
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result[property] = object1Value;
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}
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}
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}
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}
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if (object2Defined) {
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for (property in object2) {
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if (object2.hasOwnProperty(property) && !result.hasOwnProperty(property)) {
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object2Value = object2[property];
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result[property] = object2Value;
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}
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}
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}
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return result;
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}
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export default combine;
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