The Building Block of a Program INTRODUCTION

SELF REVIEW: PRACTICING WITH FUNCTIONS

1. Did you complete the Practicing with functions exercise?

2. Were there any parts of the Practicing with functions exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how to code functions with loops inside of them?

SELF REVIEW: CREATING ARRAYS AND OBJECTS

1. Did you complete the Creating arrays and objects exercise?

2. Were there any parts of the Creating arrays and objects exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how to create arrays and objects in JavaScript?

KNOWLEDGE CHECK: ARRAYS, OBJECTS AND FUNCTIONS

1. What data type is the variable item ?

  var item = [];

2. What is the value of result for the following code?

  var result = "Hello".indexOf('l');

3. What is the length of the clothes array after this code runs?

  var clothes = [];
  clothes.push('gray t-shirt');
  clothes.push('green scarf');
  clothes.pop();
  clothes.push('slippers');
  clothes.pop();
  clothes.push('boots');
  clothes.push('old jeans');

4. What value is printed out by the following code?

  var food = [];
  food.push('Chocolate');
  food.push('Ice cream');
  food.push('Donut');

  console.log(food[1])

5. How many properties does the  dog  object have after the following code is run?

  var dog = {
      color: "brown",
      height: 30,
      length: 60
  };
  dog["type"] = "corgi";

6. In the following function, the variables a and b are known as _______________.

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

7. Which of the following are functions of the Math object?

8. You are creating a function and write the following code:

 function hello() {
   console.log(“Hello world”);
 }

9. You have the following array:

 var colors = ["red", "blue", "green", "yellow"];

10. In your code, you have a value that is stored as ‘18 > 27’. If you use the typeof operator on this value, which one of these outcomes would the console return?

11. You have written the following code:

 var myNum = Math.ceil(2.49);
 console.log(myNum);

12. You have created a “worker” character for your game and would like to assign it several traits. Which of the following best describes the benefits of creating an object for this purpose? Choose all that apply.

13. You have the following variables containing string values:

 var parting = "Goodbye";

 var name = "Robin";

14. Which of the following errors occur when you write a piece of code that JavaScript cannot read?

15. The try catch JavaScript statement can keep a program running even when it encounters an error. True or false?

16. What is the expected output of the following code?

 var food;
 console.log(food);

SELF REVIEW: ERROR PREVENTION

1. Did you complete the Error Prevention exercise?

2. Were there any parts of the Error Prevention exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how to prevent errors in JavaScript?

SELF REVIEW: DEFENSIVE PROGRAMMING

1. Did you complete the Defensive Programming exercise?

2. Were there any parts of the Defensive Programming exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how to code a function declaration defensively?

KNOWLEDGE CHECK: ERROR HANDLING

1. What will be printed when the following code runs?

  var result = null;
  console.log(result);

2. When the following code runs, what will print out?

  try {
    console.log('Hello');
  } catch(err) {
    console.log('Goodbye');
  }

3. If you pass an unsupported data type to a function, what error will be thrown?

4. What will print out when the following code runs?

  var x;

  if(x === null) {
    console.log("null");
  } else if(x === undefined) {
    console.log("undefined");
  } else {
    console.log("ok");
  }

5. What will print out when the following code runs?

  throw new Error();
  console.log("Hello");

Coursera Meta Front-End Developer Professional Certificate Answers and Study Guide

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MODULE QUIZ: THE BUILDING BLOCKS OF A PROGRAM

1. What data type is the variable  x ?

  var x = {};

2. What will be the output of running the following code? 

 try {
 console.log('hello)
 } catch(e) {
 console.log('caught')
 }

3. What value is printed when the following code runs?

  var burger = ["bun", "beef", "lettuce", "tomato sauce", "onion", "bun"];
  console.log(burger[2]);

4. In the following code, how many methods does the bicycle  object have?

 var bicycle = {
      wheels: 2,
      start: function() {

      },
      stop: function() {

      }
  };

5. When the following code runs, what will print out?

  try {
    throw new Error();
    console.log('Hello');
  } catch(err) {
    console.log('Goodbye');
  }

6. If you mis-type some code in your JavaScript, what kind of error will that result in?

7. Will the following code execute without an error?

  function add(a, b) {
    console.log(a + b)
  }

  add(3, "4");

8. What will be printed when the following code runs?

  var result;
  console.log(result);

9. What will be the output of the following code?

 var str = "Hello";
 str.match("jello");

10. What will be the output of the following code?

 try {
 Number(5).toPrecision(300)
 } catch(e) {
 console.log("There was an error")
 }

The Building Block of a Program CONCLUSION