w01d5.md

HTML

1. Take a piece of paper and draw the structure of this website

Functions and Scope

1. Describe what a function is/does?
2. How do I declare a function? and how do I run a function?
3. Given the following code, what is the command to console log hello world?

var hello = function () {
  return function () {
    return function () {
      console.log("hello world");
    };
  };
};

1. Would the following code console.log destroy the world? or would it give you an error saying b is not undefined? Explain your answer.

var a = "hello world!";
var myFunction = function() {
  var b = "destroy the worl!";
}
myFunction();
console.log(b);

1. Would the following code console.log 25? or would it console.log 1? Explain your answer.

var a = 5;
var myFunction = function() {
  console.log(a*a);
}
var otherFunction = function () {
  myFunction = function() {
    console.log(a/a);
  }
}

otherFunction();
myFunction();

1. What is the difference between the following code?

function add (a) {
  return a+a;
}

add = function (a) {
  return a+a
}

1. Which of these function would work, and which one would not? Explain your answer.

console.log(a())
console.log(b())
function a () {return "321"}
b = function () {return "123"}

Objects

1. What is an object?
2. What are ways to create an object?
3. What does a property in an object contain?
4. Given the follow object. Use dot notation to get "Fer" and bracket notation to get the "Denis"

var wdi = {
  instructor1: "Fer",
  instructor2: "Denis",
  mysteriousInstructor: "Harry"
}

1. How do I create a new property in the object above?
2. How do I delete mysteriousInstructor in the object above?
3. What is this and how do we use it?
4. What is the for loop systax that is used to iterate through objects?