Quiz time

Given the following code:

1;(function() {
2  $(function() {
3    console.log('app starts');
4  });
5})();

Question: What is the $(function(){})?

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Question: What is the usage of the beginning semi-colon ; mark?

Prevent the function being treated as function argument
✔ During concatenation, in special case, this will happen: someing_before(function....)()
No use
✖ Sure it has a usage here

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Question: When is the “app starts” printed to the console?

After all the content and images loaded
✖ jQuery ready does not wait for images loading.
After the DOM tree is loaded and elements are ready
✔ jQuery ready means the DOM/elements are ready to be reference.

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Given the following code:

1(function(){
2  var hello = "world";
3  this.name = "Thomas";
4})();

Question: Is hello a global variable?

Yes, it is in global scope.
✖ `hello` is local variable because var follows function scope.
No, it is not accessible from global scope.
✔ var follows function scope. It exists until the function ends.

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Question: Is name a global variable?

Yes, it is in global scope.
✔ `this` here refers to the global context, so `name` is accessible in global scope.
No, it is not accessible from global scope.
✖ `this` here refers to the global context, so `name` is accessible in global scope.

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What’s next? We’re going to take a look at “Project 3 – Welcome Screen”.

makzan.