Introduction to JavaScript INTRODUCTION

SELF REVIEW: DECLARING VARIABLES

1. Did you complete the Declaring variables exercise?

2. Are you comfortable with using console.log?

3. Are you comfortable using the assignment operator?

4. In JavaScript you can declare a variable with the keyword var. Which one of the following statements about var is correct?

SELF REVIEW – ADVANCED USE OF OPERATORS

1. Did you complete the Advanced use of operators exercise?

2. Did you find any part of the exercise on the Advanced Use of Operators difficult?

3. Would you say that you are able to explain, in your own words, how logical operators &&, ||, and ! work in JavaScript?

KNOWLEDGE CHECK: WELCOME TO PROGRAMMING

1. What is the data type of the value “Hello, World”?

2. What is the data type of the value  true ?

3. What is the % operator?

4. What happens when you use the + operator on two strings?

5. What is the operator symbol && represent in JavaScript?

6. What happens when you use the + operator on a string and a number?

7. What is the value of  i  after the following code runs?

1
2 var i = 7;
3 i += 1;
4 i += 2;
5

SELF REVIEW: PRACTICE CONDITIONAL STATEMENTS

1. Did you complete the Practice conditional statements exercise?

2. Were there any parts of the Practice conditional statements exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how an if statement and a switch statement work in JavaScript?

SELF REVIEW: REPETITIVE TASKS WITH LOOPS

1. Did you complete the Repetitive tasks with loops exercise?

2. Were there any parts of the Repetitive tasks with loops exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, what does the i++ do?

4. Are you able to explain, in your own words, the syntax of a for loop in JavaScript?

SELF REVIEW: WORKING WITH CONDITIONALS AND LOOPS

1. Did you complete the Working with conditionals and loops exercise?

2. Were there any parts of the Working with conditionals and loops exercise that you found difficult to complete?

3. Would you say that you are able to explain, in your own words, how to code for loops and switch statements in JavaScript?

KNOWLEDGE CHECK – CONDITIONALS AND LOOPS

1. Based on the following code, what will print out when the variable  i  has the value  3 ?

  if(i < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }

2. Based on the following code, what will print out when the variable  i  has the value  1 ?

  if(i == 0 && i == 1) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }

3. How many times will the following code print the word ‘Hello’?

  for (i = 0; i < 2; i++) {
      console.log("Hello");
  }

4. How many times will the following code print the word ‘Hello’?

  var i = 0;
  while(i < 3) {
    console.log("Hello");
    i++;
  }

5. How many times will the following code print the word ‘Hello’?

  for (i = 0; i < 2; i++) {
      for (var j = 0; j < 3; j++) {
          console.log("Hello");
      }
  }

6. Based on the following code, what will print out when the variable  i  has the value  7 ?

  if(i <= 5) {
    console.log("Hello");
  } else if(i <= 10) {
    console.log("Goodnight");
  } else {
    console.log("Goodbye");
  }

7. Based on the following code, what will print out when the variable  i  has the value  3 ?

  switch(i) {
    case 1:
      console.log("Hello");
      break;
    case 2:
      console.log("Goodnight");
      break;
    case 3:
      console.log("Goodbye");
      break;
  }

8. Based on the following code, what will print out when the variable  i  has the value  3 ?

  if(i == 2 || i == 3) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }

9. The zeros and ones of binary code is a low-level language because it’s closer to being understood by a CPU. JavaScript on the other hand is a high-level language. This means that it has to be converted to binary code so that a CPU can work with it.

10. You are building a website using JavaScript. On which end of the site will JavaScript add interactivity to?

11. JavaScript is integral to our everyday online experiences. Which of the following statements are true? Choose all that apply.​ 

12. Which of the following are examples of valid strings? Choose all that apply.

13. Which of the following are examples of logical operators? Check all that apply.

14. If parentheses are not used in a mathematical calculation JavaScript will …

15. String literals are used to create string values in JavaScript. Which of the following are string literals?  Select all that apply.

16. There are various uses of the Boolean data type, one of which is to compare various values and types and it is used in conjunction with various operators such as the strict equality operator. True or false: the strict equality operator only checks for value and not type as well. 

17. True or false: An if statement can be used to run code based on a condition being true.   

18. You need to execute code based on a certain condition being either true or false. Which of the following types of statements can you use to complete this task? Select all that apply.

19. You need to execute repeated blocks of JavaScript code until a certain condition is satisfied. Can you perform this action using loops?

20. How many lines will the loop below print in the console?

for (var i = 0; i <= 3; i++) {
    console.log("This is line ", i)
}

21. True or false: A while loop will keep looping through a code block as long as a specified condition is true? 

22. You are running multiple nested loops within your JavaScript code. Could these nested loops cause performance issues with your code? 

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MODULE QUIZ: INTRODUCTION TO JAVASCRIPT

1. You can run JavaScript in a web browser’s devtools console.

2. Which of the following are valid comments in JavaScript? Select all that apply.

1
2   \    Comment 1
3

1
2   //  Comment 2 (Correct)
3

1
2   ##
3   ## Comment 3
4   ##
5

1
2   /*
3    * Comment 4 (Correct)
4   */
5

3. Which of the following are valid data types in JavaScript? Select all that apply.

4. Which of the following is the logical AND operator in JavaScript?

5. Which of the following is the assignment operator in JavaScript?

6. How many times will the following code print the word ‘Hello’?

  for(var i = 0; i <= 5; i++) {
    console.log("Hello");
  }

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

  var i = 3;
  var j = 5;

  if(i == 3 && j < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }

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

  var i = 7;
  var j = 2;

  if(i < 7 || j < 5) {
    console.log("Hello");
  } else {
    console.log("Goodbye");
  }

9. T​he result of !false is:

10. What does the operator symbol || represent in JavaScript?

Introduction to JavaScript CONCLUSION