add question hoisting-example

questions/hoisting-example.md

@@ -0,0 +1,25 @@
+### What will be the output of this code?
+
+```js
+var foo = 1;
+var foobar = function () {
+    console.log(foo);
+    var foo = 2;
+};
+foobar();
+```
+
+#### Answer
+
+Firstly `foobar` won't look for the outer scope as `var foo = 2;`'s declaration is hoisted. On the other hand,  JavaScript doesn't hoist initialization, so the output of this code is going to be `undefined`.
+
+#### Additional links
+
+* [MDN docs for hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
+
+#### Good to hear
+
+* Hoisting is Javascript’s default behavior of moving declarations to the top
+* Mention of `strict` mode
+
+<!-- tags: (javascript) -->