JavaScript 101

1. Which of the following moves the ship forward if there is no obstacle? Mark all that apply.

• 

  if (!isObstacle()) {
      forward();
  }

• 

  if (isObstacle()) {
      backward();
  } else {
      forward();
  }

• if (forward();) {
      isObstacle();
  }

• 

  if (!isObstacle()) {
      forward();
  } else {
      backward();
  }

2. The following two pieces of code do the same thing:

        if (condition) {
            forward();
        } 


        if (condition) {
            forward();
        } else {
            backward();
        }

• True
• False

3. You are given three variables, A=true, B=false and C=false. What is the value of the expression A && ( B || C )?

• true
• false
• maybe
• null

4. When would you use an "if-else" statement over an "if" statement?

• When you want to stop running code once the condition is false
• When you want to run different code if a condition is false
• When you want to run code and then check if the condition is true after
• They have the exact same function

5. Which part of a conditional goes in the parentheses?

• The word “if”
• The word “else”
• The code to run
• The condition

6. There is no difference between an "if" statement and an "if-else" statement.

• True
• False

7. A conditional, "if" or "if-else" statement, checks the condition in the parentheses and executes the code in the brackets if the condition evaluates to true.

    if(condition){
        //execute code here
    }

• True
• False

8. The following pieces of code are the exact same in functionality.

    if (condition1) {
        function1();
    }
    if (condition2) {
        function2();
    }


    if (condition1) {
        function1();
    } else if (condition2) {
        function2();
    }

• True
• False

9. If you wanted to run different code given different conditions, how would you do that?

• Combine all the conditions in one condition using “or”
• Use “else if” statements
• Put everything in the “else” statement
• Create two functions

10. When running this code, what will the ship do if it is blocked by an obstacle?

    if (!isObstacle()) {
        forward();
    }

• Move forward
• Move backward
• Do nothing
• Return with an error

11. What is the output of this code?

    var x = 2;
    if (x > 0) {
        println(“hello”);
    } else {
        println(“goodbye”);
    }
    println(“world”);

• hello
• goodbye
• 

  hello
  world
  

• goodbye
  world
  

12. What is the output of this code?

    var x = 2;
    if (x > 0) {
        println(“hello”);
    } else {
        println(“goodbye”);
        println(“world”);
    }

• hello
• goodbye

• hello
  world
  

• goodbye
  world
  

13. What is the output of this code?

    var x = 2;
    if (x > 0) {
        println(“hello”);
    } else if (x < 0) {
        println(“goodbye”);
    } else {
        printl("world");
    }

• hello
• goodbye
• world
• hello world

14. What does this code return?

    var x = 2; 
    if (x != 2) {
        return 1;
    } else if (x == 2) {
        return 2;
    } else {
        return 3;
    }

• 1
• 2
• 3
• It will return with an error