App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 895 · 40 questions

Developer's tip (Box, list, place): A variable holds one value; a list holds many in order. Positions start at 0. push adds to the end; pop takes off the last item; length is how many items. On the phone: works offline, private. In the cloud: shared, any device, needs the internet.

1. 1.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 10 (d) 1
2. 2.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) a shared to-do list (d) a draft you are typing
3. 3.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) never need a password (c) skip the internet (d) use it on any device
4. 4.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
5. 5.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) in the cloud (b) on the phone
6. 6.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
7. 7.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) a draft you are typing (d) your last game level
8. 8.Which of these fits saving on the phone? (a) chat messages to friends (b) the sound on/off setting (c) a class leaderboard (d) a shared to-do list
9. 9.💾 What does this code show? (Positions start at 0.)
   let friends = ["Arjun", "Aman", "Riya", "Kabir", "Meera"];
   show(friends[3]); (a) Kabir (b) Arjun (c) Riya (d) Aman
10. 10.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Kabir", "Zoya"];
    show(friends[1]); (a) Arjun (b) Zoya (c) Kabir
11. 11.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Maths", "Music", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Sports (c) Maths (d) Art
12. 12.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Meera", "Riya"];
    show(friends[2]); (a) Meera (b) Aman (c) Riya
13. 13.💾 What number does this code show?
    let lives = 7;
    lives = lives - 3;
    lives = lives + 1;
    show(lives);
14. 14.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) photos on two devices (d) the sound on/off setting
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Hindi", "Sports", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Sports (c) Hindi (d) Maths
16. 16.💾 What is a variable? (a) a picture (b) a phone setting (c) a type of screen (d) a named box for a value
17. 17.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
18. 18.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Hindi", "Sports", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Music (c) Sports (d) Maths
20. 20.True or false: your last game level fits saving on the phone. (a) False (b) True
21. 21.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Aman", "Kabir", "Zoya", "Meera"];
    show(friends[0]); (a) Kabir (b) Aman (c) Zoya (d) Riya
22. 22.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
23. 23.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Arjun", "Aman", "Zoya", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Arjun (c) Aman (d) Riya
24. 24.💾 Which can hold many values in order? (a) a single number (b) a list (c) a button (d) a switch
25. 25.True or false: your last game level fits saving in the cloud. (a) True (b) False
26. 26.💾 What number does this code show?
    let friends = ["Kabir", "Arjun"];
    friends.push("Aman");
    show(friends.length);
27. 27.💾 Which works with no internet at all? (a) a cloud backup (b) a cloud leaderboard (c) data saved on the phone (d) a shared chat
28. 28.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Kabir", "Zoya"];
    show(friends[2]); (a) Riya (b) Kabir (c) Zoya
29. 29.💾 What number does this code show?
    let stars = 3;
    stars = stars - 1;
    stars = stars + 3;
    show(stars);
30. 30.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
31. 31.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
32. 32.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
33. 33.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Rain", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Rain (c) Monsoon
34. 34.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
35. 35.💾 What number does this code show?
    let score = 6;
    score = score - 2;
    score = score + 3;
    show(score);
36. 36.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Ocean", "Sunrise", "Rain", "Monsoon"];
    show(songs[3]); (a) Sunrise (b) Stars (c) Ocean (d) Rain
37. 37.💾 What number does this code show?
    let friends = ["Aman", "Riya", "Kabir"];
    friends.push("Meera");
    friends.push("Arjun");
    show(friends.length);
38. 38.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Music", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Music (c) Maths
39. 39.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
40. 40.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Monsoon", "Ocean"];
    show(songs[0]); (a) Monsoon (b) Stars (c) Ocean

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