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----
-title: Object.assign()
-slug: Web/JavaScript/Reference/Global_Objects/Object/assign
-translation_of: Web/JavaScript/Reference/Global_Objects/Object/assign
----
-<p>{{JSRef}}</p>
-
-<p dir="rtl">מתודת <span class="seoSummary"><strong><code>Object.assign</code> מעתיקה אובייקט על שלל </strong>{{jsxref("Object/propertyIsEnumerable", "מאפייניו", "", "1")}} {{jsxref("Object/hasOwnProperty", "הקיימים", "", "1")}} לאובייקט אחר וממזגת אותם ביחד. המתודה מחזירה את האובייקט שאליו העתקנו את התכונות החדשות. </span></p>
-
-<div dir="rtl">תחביר</div>
-
-<pre class="syntaxbox notranslate">Object.assign(<var>target</var>, ...<var>sources</var>)</pre>
-
-<h3 dir="rtl" id="פרמטרים">פרמטרים</h3>
-
-<dl>
- <dt dir="rtl"><code><var>target - אובייקט היעד</var></code></dt>
- <dd dir="rtl">אובייקט היעד- האובייקט שאליו אנחנו מעתיקים את כל המאפיינים של האובייקט המקורי, כאשר הוא מחזיר את האובייקט אחרי המיזוג.</dd>
- <dt dir="rtl"><code><var>sources - אובייקט המקור</var></code></dt>
- <dd></dd>
-</dl>
-
-<dl>
- <dd dir="rtl">אובייקט המקור - האובייקט מכיל את המאפיינים שאנחנו רוצים להעתיק לאובייקט נוסף. </dd>
-</dl>
-
-<h3 dir="rtl" id="Return_value_-_הנתון_התוצאה">Return value - הנתון התוצאה</h3>
-
-<p dir="rtl">The target object - האובייקט שאליו העתקנו את התכונות של האובייקט המקורי.</p>
-
-<h2 dir="rtl" id="תיאור">תיאור</h2>
-
-<p dir="rtl">מאפיינים באובייקט היעד ישוכתבו או ידרסו ע"י המאפיינים של אובייקט המקור אם הם חולקים את אותו ה-{{jsxref("Object/keys", "key", "", 1)}}. מאפיינים חדשים שיוגדו על מאפיינים משותפים (properties) בהמשך ידרסו גם באובייקט היעד וגם באופייקט המקור.</p>
-
-<p dir="rtl"></p>
-
-<p>The <code>Object.assign()</code> method only copies <em>enumerable</em> and <em>own</em> properties from a source object to a target object. It uses <code>[[Get]]</code> on the source and <code>[[Set]]</code> on the target, so it will invoke <a href="/en-US/docs/Web/JavaScript/Reference/Functions/get">getters</a> and <a href="/en-US/docs/Web/JavaScript/Reference/Functions/set">setters</a>. Therefore it <em>assigns</em> properties, versus copying or defining new properties. This may make it unsuitable for merging new properties into a prototype if the merge sources contain getters.</p>
-
-<p>For copying property definitions (including their enumerability) into prototypes, use {{jsxref("Object.getOwnPropertyDescriptor()")}} and {{jsxref("Object.defineProperty()")}} instead.</p>
-
-<p>Both {{jsxref("String")}} and {{jsxref("Symbol")}} properties are copied.</p>
-
-<p>In case of an error, for example if a property is non-writable, a {{jsxref("TypeError")}} is raised, and the <code><var>target</var></code> object is changed if any properties are added before the error is raised.</p>
-
-<div class="blockIndicator note">
-<p><strong>Note:</strong> <code>Object.assign()</code> does not throw on {{jsxref("null")}} or {{jsxref("undefined")}} sources.</p>
-</div>
-
-<h2 id="Polyfill">Polyfill</h2>
-
-<p>This <a href="/en-US/docs/Glossary/Polyfill">polyfill</a> doesn't support symbol properties, since ES5 doesn't have symbols anyway:</p>
-
-<pre class="brush: js notranslate">if (typeof Object.assign !== 'function') {
-  // Must be writable: true, enumerable: false, configurable: true
-  Object.defineProperty(Object, "assign", {
-    value: function assign(target, varArgs) { // .length of function is 2
-      'use strict';
-      if (target === null || target === undefined) {
-        throw new TypeError('Cannot convert undefined or null to object');
-      }
-
-      var to = Object(target);
-
-      for (var index = 1; index &lt; arguments.length; index++) {
-        var nextSource = arguments[index];
-
-        if (nextSource !== null &amp;&amp; nextSource !== undefined) {
-          for (var nextKey in nextSource) {
-            // Avoid bugs when hasOwnProperty is shadowed
-            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
-              to[nextKey] = nextSource[nextKey];
-            }
-          }
-        }
-      }
-      return to;
-    },
-    writable: true,
-    configurable: true
-  });
-}
-</pre>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Cloning_an_object">Cloning an object</h3>
-
-<pre class="brush: js notranslate">const obj = { a: 1 };
-const copy = Object.assign({}, obj);
-console.log(copy); // { a: 1 }
-</pre>
-
-<h3 id="Deep_Clone" name="Deep_Clone">Warning for Deep Clone</h3>
-
-<p>For deep cloning, we need to use alternatives, because <code>Object.assign()</code> copies property values.</p>
-
-<p>If the source value is a reference to an object, it only copies the reference value.</p>
-
-<pre class="brush: js notranslate">function test() {
-  'use strict';
-
-  let obj1 = { a: 0 , b: { c: 0}};
-  let obj2 = Object.assign({}, obj1);
-  console.log(JSON.stringify(obj2)); // { "a": 0, "b": { "c": 0}}
-
-  obj1.a = 1;
-  console.log(JSON.stringify(obj1)); // { "a": 1, "b": { "c": 0}}
-  console.log(JSON.stringify(obj2)); // { "a": 0, "b": { "c": 0}}
-
-  obj2.a = 2;
-  console.log(JSON.stringify(obj1)); // { "a": 1, "b": { "c": 0}}
-  console.log(JSON.stringify(obj2)); // { "a": 2, "b": { "c": 0}}
-
-  obj2.b.c = 3;
-  console.log(JSON.stringify(obj1)); // { "a": 1, "b": { "c": 3}}
-  console.log(JSON.stringify(obj2)); // { "a": 2, "b": { "c": 3}}
-
-  // Deep Clone
-  obj1 = { a: 0 , b: { c: 0}};
-  let obj3 = JSON.parse(JSON.stringify(obj1));
-  obj1.a = 4;
-  obj1.b.c = 4;
-  console.log(JSON.stringify(obj3)); // { "a": 0, "b": { "c": 0}}
-}
-
-test();</pre>
-
-<h3 id="Merging_objects">Merging objects</h3>
-
-<pre class="brush: js notranslate">const o1 = { a: 1 };
-const o2 = { b: 2 };
-const o3 = { c: 3 };
-
-const obj = Object.assign(o1, o2, o3);
-console.log(obj); // { a: 1, b: 2, c: 3 }
-console.log(o1);  // { a: 1, b: 2, c: 3 }, target object itself is changed.</pre>
-
-<h3 id="Merging_objects_with_same_properties">Merging objects with same properties</h3>
-
-<pre class="brush: js notranslate">const o1 = { a: 1, b: 1, c: 1 };
-const o2 = { b: 2, c: 2 };
-const o3 = { c: 3 };
-
-const obj = Object.assign({}, o1, o2, o3);
-console.log(obj); // { a: 1, b: 2, c: 3 }</pre>
-
-<p>The properties are overwritten by other objects that have the same properties later in the parameters order.</p>
-
-<h3 id="Copying_symbol-typed_properties">Copying symbol-typed properties</h3>
-
-<pre class="brush: js notranslate">const o1 = { a: 1 };
-const o2 = { [Symbol('foo')]: 2 };
-
-const obj = Object.assign({}, o1, o2);
-console.log(obj); // { a : 1, [Symbol("foo")]: 2 } (cf. bug 1207182 on Firefox)
-Object.getOwnPropertySymbols(obj); // [Symbol(foo)]
-</pre>
-
-<h3 id="Properties_on_the_prototype_chain_and_non-enumerable_properties_cannot_be_copied">Properties on the prototype chain and non-enumerable properties cannot be copied</h3>
-
-<pre class="brush: js notranslate">const obj = Object.create({ foo: 1 }, { // foo is on obj's prototype chain.
-  bar: {
-    value: 2  // bar is a non-enumerable property.
-  },
-  baz: {
-    value: 3,
-    enumerable: true  // baz is an own enumerable property.
-  }
-});
-
-const copy = Object.assign({}, obj);
-console.log(copy); // { baz: 3 }
-</pre>
-
-<h3 id="Primitives_will_be_wrapped_to_objects">Primitives will be wrapped to objects</h3>
-
-<pre class="brush: js notranslate">const v1 = 'abc';
-const v2 = true;
-const v3 = 10;
-const v4 = Symbol('foo');
-
-const obj = Object.assign({}, v1, null, v2, undefined, v3, v4);
-// Primitives will be wrapped, null and undefined will be ignored.
-// Note, only string wrappers can have own enumerable properties.
-console.log(obj); // { "0": "a", "1": "b", "2": "c" }
-</pre>
-
-<h3 id="Exceptions_will_interrupt_the_ongoing_copying_task">Exceptions will interrupt the ongoing copying task</h3>
-
-<pre class="brush: js notranslate">const target = Object.defineProperty({}, 'foo', {
-  value: 1,
-  writable: false
-}); // target.foo is a read-only property
-
-Object.assign(target, { bar: 2 }, { foo2: 3, foo: 3, foo3: 3 }, { baz: 4 });
-// TypeError: "foo" is read-only
-// The Exception is thrown when assigning target.foo
-
-console.log(target.bar);  // 2, the first source was copied successfully.
-console.log(target.foo2); // 3, the first property of the second source was copied successfully.
-console.log(target.foo);  // 1, exception is thrown here.
-console.log(target.foo3); // undefined, assign method has finished, foo3 will not be copied.
-console.log(target.baz);  // undefined, the third source will not be copied either.
-</pre>
-
-<h3 id="Copying_accessors">Copying accessors</h3>
-
-<pre class="brush: js notranslate">const obj = {
-  foo: 1,
-  get bar() {
-    return 2;
-  }
-};
-
-let copy = Object.assign({}, obj);
-console.log(copy);
-// { foo: 1, bar: 2 }
-// The value of copy.bar is obj.bar's getter's return value.
-
-// This is an assign function that copies full descriptors
-function completeAssign(target, ...sources) {
-  sources.forEach(source =&gt; {
-    let descriptors = Object.keys(source).reduce((descriptors, key) =&gt; {
-      descriptors[key] = Object.getOwnPropertyDescriptor(source, key);
-      return descriptors;
-    }, {});
-
-    // By default, Object.assign copies enumerable Symbols, too
-    Object.getOwnPropertySymbols(source).forEach(sym =&gt; {
-      let descriptor = Object.getOwnPropertyDescriptor(source, sym);
-      if (descriptor.enumerable) {
-        descriptors[sym] = descriptor;
-      }
-    });
-    Object.defineProperties(target, descriptors);
-  });
-  return target;
-}
-
-copy = completeAssign({}, obj);
-console.log(copy);
-// { foo:1, get bar() { return 2 } }
-</pre>
-
-<h2 id="Specifications">Specifications</h2>
-
-<table class="standard-table">
- <thead>
-  <tr>
-   <th scope="col">Specification</th>
-  </tr>
- </thead>
- <tbody>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-object.assign', 'Object.assign')}}</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("javascript.builtins.Object.assign")}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li>{{jsxref("Object.defineProperties()")}}</li>
- <li><a href="/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
- <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#Spread_in_object_literals">Spread in object literals</a></li>
-</ul>