JavaScript 101

1. How far will a ship move using the following code?

for (i = 1; i < 5; i++) {
    forward();
}

• 3
• 4
• 5
• 6

2. Which "for" loop will move a ship 5 times?

• for(i = 0; i < 6; i++) {
      forward();
  }

• for(i = 1; i <5; i++) {
      forward();
  }

• 

  for(i = 0; i < 5; i++) {
      forward();
  }

• for(i = 1; i < 3; i++) {
      forward();
  }

3. The following "for" loop has correct syntax.

for (i = 0, i = 5, i++)

• True
• False

4. How many times will “function1” be called?

for (i = 0; i < 10; i++) {
    for (j = 0; j < 10; j++) {
        function1();
    }
}

• 10
• 20
• 100
• 200

5. Which is the correct syntax to make a "for" loop run for all numbers from 0 to 10?

• for(i = 1; i < 10; i++)

• for(i = 10; i = 0; i--)

• for(i = 0; i < 10; i++)

• 

  for(i = 0; i <= 10; i++)

6. The following loop will go from i = 5 to i = 1.

for (i = 5; i >= 1; i++)

• True
• False

7. Which of the following will print all even numbers 2 through 10? Mark all that apply.

• for (i = 2; i < 10; i++) {
      print(i);
  }

• for (i = 2; i < 10; i = i + 2) {
      print(i);
  }

• 

  for (i = 2; i <= 10; i = i + 2) {
      print(i);
  }

• 

  for (i = 1; i <= 5; i++) {
      print(2*i);
  }

8. The following code will print "hello" 25 times.

for (i = 0; i < 5; i++) {
    for(i = 0; i < 5; i++) {
        print("hello");
    }
}

• True
• False

9. "For" loops can increment upwards or downwards.

• True
• False

10. Choose the following "for" loops that repeat 5 times.

• for(i = 0; i < 5; i++)
• for(i = 0; i <= 5; i++)
• for(i = 1; i < 10; i = i + 2)
• for (i = 5; i < 10; i++)

11. Select the invalid "for" loops.

• for (i = 10; i < 15; i++)
• for (i - 10; i + 15; i++)
• for (i = 10, i <= 15, i++)
• for (i < 10; i < 20; i++)

12. How many times will the following "for" loop execute?

    for (i = 10; i > 5; i++)

• 5
• 10
• 20
• Infinite

13. What will the following "for" loop print?

for(i = 0; i < 2; i++) {
    print('a');
}

• a
• aa
• aaa
• aaaa

14. What will the following "for" loop print?

for(i = 2; i < 9; i = i * 2) {
     print(i + 1);
}

• 2 4 8
• 2 3 4 5 6 7 8
• 3 5 9
• 3 5 9 17

15. Which of the following is properly indented code?

• function foo(){
  bar();}
  

• 

  function foo() {
           bar();
  }  
  

• function foo(){
              bar(
              );
              }
  

16. Why should you indent your code?

• In JavaScript, the program’s execution changes based on whether you indent or not
• Code that is not indented will produce syntax errors
• Indenting organizes your code and helps minimize possible mistakes you make
• All of the above

17. Which of the following produce errors in JavaScript?

• Indenting incorrectly
• Commenting incorrectly
• Naming variables and functions without the camelCase naming convention
• All of the above