import forOwn from './forOwn';

/**
 * Combine properties from all the objects into first one.
 * - This method affects target object in place, if you want to create a new Object pass an empty
 * object as first param.
 * @param {object} target    Target Object
 * @param {...object} objects    Objects to be combined (0...n objects).
 * @return {object} Target Object.
 */
function mixIn(target, ...objects) {
    let i = 0;
    const n = arguments.length;
    let obj;
    while (++i < n) {
        obj = arguments[i];
        if (obj != null) {
            forOwn(obj, copyProp, target);
        }
    }
    return target;
}

function copyProp(val, key) {
    this[key] = val;
}

export default mixIn;