JavaScript Worksheet: If and For Loops

HTML and CSS lesson 26: JavaScript if and for loops · Set 161 · 40 questions

Code tip (Check, then count): if (condition) { … } else { … }: only one of the two parts runs. for (let i = 0; i < 5; i++) runs for i = 0, 1, 2, 3, 4 — 5 times. With i <= n it includes n; with i = i + 2 it goes up in twos.

1. 1.🔁 How many numbers does this code print?
   for (let i = 0; i < 7; i = i + 2) {
     console.log(i);
   }
2. 2.🔁 What does i++ do? (a) doubles i (b) takes 1 from i (c) adds 1 to i (d) prints i
3. 3.🔁 Which word runs code only when something is true? (a) for (b) if (c) let (d) log
4. 4.🔁 What does this code print?
   let score = 13;
   if (score > 30) {
     console.log("You win");
   } else {
     console.log("Play again");
   } (a) You win (b) Play again
5. 5.🔁 When does the else part run? (a) when if is true (b) when if is false (c) always (d) never
6. 6.🔁 How many times does this code print “Well done”?
   for (let i = 2; i <= 9; i++) {
     console.log("Well done");
   }
7. 7.🔁 What does this code print?
   let age = 17;
   if (age >= 21) {
     console.log("teen");
   } else {
     console.log("child");
   } (a) child (b) teen
8. 8.🔁 What does this code print?
   let marks = 21;
   if (marks > 15) {
     console.log("Pass");
   } else {
     console.log("Try again");
   } (a) Try again (b) Pass
9. 9.🔁 What number does this code print?
   let total = 0;
   for (let i = 1; i <= 6; i++) {
     total = total + 7;
   }
   console.log(total);
10. 10.🔁 What number does this code print?
    let total = 0;
    for (let i = 1; i <= 8; i++) {
      total = total + i;
    }
    console.log(total);
11. 11.🔁 What does this code print?
    let score = 37;
    if (score < 37) {
      console.log("You win");
    } else {
      console.log("Play again");
    } (a) Play again (b) You win
12. 12.🔁 How many numbers does this code print?
    for (let i = 0; i < 5; i = i + 2) {
      console.log(i);
    }
13. 13.🔁 What does this code print?
    let marks = 47;
    if (marks < 7) {
      console.log("Pass");
    } else {
      console.log("Try again");
    } (a) Try again (b) Pass
14. 14.🔁 How many times does this code print “Well done”?
    for (let i = 0; i <= 6; i++) {
      console.log("Well done");
    }
15. 15.🔁 What does this code print?
    let temp = 20;
    if (temp >= 8) {
      console.log("Hot");
    } else {
      console.log("Cool");
    } (a) Cool (b) Hot
16. 16.🔁 What does this code print?
    let age = 49;
    if (age >= 7) {
      console.log("teen");
    } else {
      console.log("child");
    } (a) child (b) teen
17. 17.🔁 What does this code print?
    let temp = 21;
    if (temp > 8) {
      console.log("Hot");
    } else {
      console.log("Cool");
    } (a) Cool (b) Hot
18. 18.🔁 How many times does this code print “Well done”?
    for (let i = 0; i < 5; i++) {
      console.log("Well done");
    }
19. 19.🔁 How many times does this code print “Hi”?
    for (let i = 0; i <= 5; i++) {
      console.log("Hi");
    }
20. 20.🔁 What does this code print?
    let score = 27;
    if (score < 44) {
      console.log("You win");
    } else {
      console.log("Play again");
    } (a) You win (b) Play again
21. 21.🔁 What does this code print?
    let temp = 35;
    if (temp < 29) {
      console.log("Hot");
    } else {
      console.log("Cool");
    } (a) Cool (b) Hot
22. 22.🔁 How many times does this code print “Hi”?
    for (let i = 2; i <= 10; i++) {
      console.log("Hi");
    }
23. 23.🔁 What is the LAST number this code prints?
    for (let i = 0; i < 10; i = i + 3) {
      console.log(i);
    }
24. 24.🔁 What does this code print?
    let age = 20;
    if (age >= 12) {
      console.log("teen");
    } else {
      console.log("child");
    } (a) teen (b) child
25. 25.🔁 What does this code print?
    let marks = 10;
    if (marks > 39) {
      console.log("Pass");
    } else {
      console.log("Try again");
    } (a) Try again (b) Pass
26. 26.🔁 What is the LAST number this code prints?
    for (let i = 0; i < 16; i = i + 3) {
      console.log(i);
    }
27. 27.🔁 What does this code print?
    let temp = 28;
    if (temp < 24) {
      console.log("Hot");
    } else {
      console.log("Cool");
    } (a) Cool (b) Hot
28. 28.🔁 How many times does this code print “Welcome”?
    for (let i = 0; i < 5; i++) {
      console.log("Welcome");
    }
29. 29.🔁 How many times does this code print “Hello”?
    for (let i = 1; i <= 5; i++) {
      console.log("Hello");
    }
30. 30.🔁 What is the LAST number this code prints?
    for (let i = 0; i < 20; i = i + 2) {
      console.log(i);
    }
31. 31.🔁 Which loop repeats code a set number of times? (a) for (b) let (c) if (d) else
32. 32.🔁 How many times does this code print “Hi”?
    for (let i = 2; i <= 4; i++) {
      console.log("Hi");
    }
33. 33.🔁 How many times does this code print “Hello”?
    for (let i = 1; i < 3; i++) {
      console.log("Hello");
    }
34. 34.🔁 What does this code print?
    let score = 6;
    if (score > 9) {
      console.log("You win");
    } else {
      console.log("Play again");
    } (a) You win (b) Play again
35. 35.🔁 What is the LAST number this code prints?
    for (let i = 0; i < 11; i = i + 2) {
      console.log(i);
    }
36. 36.🔁 How many times does this code print “Welcome”?
    for (let i = 1; i < 5; i++) {
      console.log("Welcome");
    }
37. 37.🔁 How many times does this code print “Hello”?
    for (let i = 2; i < 4; i++) {
      console.log("Hello");
    }
38. 38.🔁 How many numbers does this code print?
    for (let i = 0; i < 9; i = i + 4) {
      console.log(i);
    }
39. 39.🔁 What number does this code print?
    let total = 0;
    for (let i = 1; i <= 7; i++) {
      total = total + i;
    }
    console.log(total);
40. 40.🔁 How many times does this code print “Hello”?
    for (let i = 0; i <= 6; i++) {
      console.log("Hello");
    }

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