JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 124 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What number does this code print?
   let a = 6;
   let b = 24;
   console.log(a + b);
2. 2.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
3. 3.⚡ What number does this code print?
   let a = 34;
   let b = 15;
   console.log(a - b);
4. 4.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 15;
   coins = coins - 14;
   console.log(coins);
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) name (d) Welcome, name!
6. 6.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) Hello, Zoya! (d) name
7. 7.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 95 (b) Error (c) 14
10. 10.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
11. 11.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) let
12. 12.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
14. 14.⚡ What number does this code print?
    let books = 14;
    books = books + 19;
    books = books - 8;
    console.log(books);
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 3;
    runs = runs - 7;
    console.log(runs);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) Error (c) 12
20. 20.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
21. 21.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 4;
    runs = runs - 14;
    console.log(runs);
22. 22.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 15;
    apples = apples - 6;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 24;
    console.log(a + b);
24. 24.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
25. 25.⚡ What number does this code print?
    let a = 56;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 25;
    score = score + 4;
    score = score - 9;
    console.log(score);
27. 27.⚡ What number does this code print?
    let books = 30;
    books = books + 12;
    books = books - 36;
    console.log(books);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
29. 29.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 7;
    apples = apples - 9;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 5;
    coins = coins - 8;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let a = 35;
    let b = 19;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 7;
    coins = coins - 3;
    console.log(coins);
33. 33.⚡ What number does this code print?
    let a = 33;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
35. 35.⚡ What number does this code print?
    let a = 5;
    let b = 37;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
37. 37.⚡ What number does this code print?
    let a = 23;
    let b = 18;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) Error (c) 13
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69

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