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- 'use strict';
- var isObject = require('is-extendable');
- module.exports = function extend(o/*, objects*/) {
- if (!isObject(o)) { o = {}; }
- var len = arguments.length;
- for (var i = 1; i < len; i++) {
- var obj = arguments[i];
- if (isObject(obj)) {
- assign(o, obj);
- }
- }
- return o;
- };
- function assign(a, b) {
- for (var key in b) {
- if (hasOwn(b, key)) {
- a[key] = b[key];
- }
- }
- }
- /**
- * Returns true if the given `key` is an own property of `obj`.
- */
- function hasOwn(obj, key) {
- return Object.prototype.hasOwnProperty.call(obj, key);
- }
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