Function clone

_benchmarks/sample_echarts.js:204–241

(source)

        }
    }
    function clone(source) {
        if (source == null || typeof source !== 'object') {
            return source;
        }
        var result = source;
        var typeStr = objToString.call(source);
        if (typeStr === '[object Array]') {
            if (!isPrimitive(source)) {
                result = [];
                for (var i = 0, len = source.length; i < len; i++) {
                    result[i] = clone(source[i]);
                }
            }
        }
        else if (TYPED_ARRAY[typeStr]) {
            if (!isPrimitive(source)) {
                var Ctor = source.constructor;
                if (Ctor.from) {
                    result = Ctor.from(source);
                }
                else {
                    result = new Ctor(source.length);
                    for (var i = 0, len = source.length; i < len; i++) {
                        result[i] = clone(source[i]);
                    }
                }
            }
        }
        else if (!BUILTIN_OBJECT[typeStr] && !isPrimitive(source) && !isDom(source)) {
            result = {};
            for (var key in source) {
                if (source.hasOwnProperty(key)) {
                    result[key] = clone(source[key]);
                }
            }
        }
        return result;
    }
    function merge(target, source, overwrite) {
        if (!isObject(source) || !isObject(target)) {
            return overwrite ? clone(source) : target;