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1-js/4-object-basics/01-object/8-multiply-numeric/_js.view/solution.js

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+function multiplyNumeric(obj) {
+  for (let key in obj) {
+    if (typeof obj[key] == 'number') {
+      obj[key] *= 2;
+    }
+  }
+}

1-js/4-object-basics/01-object/8-multiply-numeric/_js.view/source.js

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+let menu = {
+  width: 200,
+  height: 300,
+  title: "My menu"
+};
+
+
+function multiplyNumeric(obj) {
+  
+  /* your code */
+
+}
+
+multiplyNumeric(menu);
+
+alert( "menu width=" + menu.width + " height=" + menu.height + " title=" + menu.title );
+

1-js/4-object-basics/01-object/8-multiply-numeric/_js.view/test.js

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+describe("multiplyNumeric", function() {
+  it("multiplies all numeric properties by 2", function() {
+    var menu = {
+      width: 200,
+      height: 300,
+      title: "My menu"
+    };
+    let result = multiplyNumeric(menu);
+    assert.equal(menu.width, 400);
+    assert.equal(menu.height, 600);
+    assert.equal(menu.title, "My menu");
+  });
+
+  it("returns nothing", function() {
+    assert.isUndefined( multiplyNumeric({}) );
+  });
+  
+});

1-js/4-object-basics/01-object/8-multiply-numeric/task.md

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+importance: 3
+
+---
+
+# Multiply numeric properties by 2
+
+Create a function `multiplyNumeric(obj)` that multiplies all numeric properties of `obj` by `2`.
+
+For instance:
+
+```js
+// before the call
+let menu = {
+  width: 200,
+  height: 300,
+  title: "My menu"
+};
+
+multiplyNumeric(menu);
+
+// after the call
+menu = {
+  width: 400,
+  height: 600,
+  title: "My menu"
+};
+```
+
+Please note that `multiplyNumeric` does not need to return anything. It should modify the object in-place.
+
+P.S. Use `typeof` to check for a number here.
+
+