ok

1-js/4-object-basics/01-object/3-is-empty/_js.view/solution.js

@@ -0,0 +1,7 @@
+function isEmpty(obj) {
+  for (let key in obj) {
+    // if the loop has started, there is a prorty
+    return false;
+  }
+  return true;
+}

1-js/4-object-basics/01-object/3-is-empty/_js.view/test.js

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+describe("isEmpty", function() {
+  it("returns true for an empty object", function() {
+    assert.isTrue(isEmpty({}));
+  });
+
+  it("returns false if a property exists", function() {
+    assert.isFalse(isEmpty({
+      anything: false
+    }));
+  });
+});

1-js/4-object-basics/01-object/3-is-empty/solution.md

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+Just loop over the object and `return false` immediately if there's at least one property.
+
+```js
+function isEmpty(obj) 
+  for(let key in obj) {
+    return false;
+  }
+  return true;
+}
+```
+

1-js/4-object-basics/01-object/3-is-empty/task.md

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+importance: 5
+
+---
+
+# Check for emptiness
+
+Write the function `isEmpty(obj)` which returns `true` if the object has no properties, `false` otherwise.
+
+Should work like that:
+
+```js
+let schedule = {};
+
+alert( isEmpty(schedule) ); // true
+
+schedule["8:30"] = "get up";
+
+alert( isEmpty(schedule) ); // false
+```
+