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44 lines
1.1 KiB
44 lines
1.1 KiB
import { isPlainObject } from "./isPlainObject.js";
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/**
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* Merge the contents of two or more objects together into the first object.
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* If passing "true" for first argument, the merge becomes recursive (aka. deep copy).
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* @param {...any} args
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* @returns {Object}
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*/
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export const extend = (...args) => {
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let deep = false;
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if (typeof args[0] == "boolean") {
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deep = args.shift();
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}
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let result = args[0];
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if (!result || typeof result !== "object") {
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throw new Error("extendee must be an object");
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}
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const extenders = args.slice(1);
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const len = extenders.length;
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for (let i = 0; i < len; i++) {
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const extender = extenders[i];
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for (let key in extender) {
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if (extender.hasOwnProperty(key)) {
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const value = extender[key];
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if (deep && (Array.isArray(value) || isPlainObject(value))) {
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const base = Array.isArray(value) ? [] : {};
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result[key] = extend(true, result.hasOwnProperty(key) ? result[key] : base, value);
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} else {
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result[key] = value;
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}
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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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