App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 736 · 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.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) notes to read offline (d) photos on two devices
2. 2.💾 What number does this code show?
   let friends = ["Aman", "Riya"];
   friends.push("Zoya");
   friends.push("Meera");
   show(friends.length);
3. 3.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
4. 4.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
5. 5.💾 What number does this code show?
   let coins = 6;
   coins = coins - 4;
   coins = coins + 5;
   show(coins);
6. 6.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 10 (c) 2 (d) 1
7. 7.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) photos on two devices (d) notes to read offline
8. 8.💾 What number does this code show?
   let coins = 6;
   coins = coins - 2;
   coins = coins + 2;
   show(coins);
9. 9.💾 What number does this code show?
   let score = 3;
   score = score - 1;
   score = score + 5;
   show(score);
10. 10.💾 Which can hold many values in order? (a) a button (b) a switch (c) a single number (d) a list
11. 11.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Art", "Maths", "Science", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Science (c) Sports (d) Art
12. 12.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Kabir", "Zoya", "Riya"];
    show(friends[1]); (a) Arjun (b) Riya (c) Kabir (d) Zoya
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Art", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Art
14. 14.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
15. 15.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
16. 16.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
17. 17.💾 Which works with no internet at all? (a) a shared chat (b) a cloud leaderboard (c) data saved on the phone (d) a cloud backup
18. 18.💾 What number does this code show?
    let stars = 8;
    stars = stars - 6;
    stars = stars + 1;
    show(stars);
19. 19.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) the sound on/off setting (d) chat messages to friends
20. 20.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
21. 21.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Riya", "Kabir", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Riya (c) Kabir (d) Meera
22. 22.💾 What number does this code show?
    let stars = 3;
    stars = stars - 2;
    stars = stars + 2;
    show(stars);
23. 23.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Sports", "Hindi", "Maths", "Science"];
    show(notes[1]); (a) Hindi (b) Art (c) Maths (d) Sports
24. 24.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) the sound on/off setting
25. 25.💾 What number does this code show?
    let stars = 6;
    stars = stars - 1;
    stars = stars + 2;
    show(stars);
26. 26.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 2;
    show(score);
28. 28.💾 What number does this code show?
    let notes = ["Maths", "Sports"];
    notes.push("Science");
    show(notes.length);
29. 29.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
30. 30.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Art", "Science", "Maths"];
    show(notes[1]); (a) Sports (b) Art (c) Maths (d) Science
31. 31.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Zoya", "Arjun", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Arjun (c) Kabir (d) Meera
32. 32.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) never need a password (d) skip the internet
33. 33.Which of these fits saving in the cloud? (a) your last game level (b) a shared to-do list (c) a draft you are typing (d) notes to read offline
34. 34.💾 What number does this code show?
    let score = 8;
    score = score - 6;
    score = score + 2;
    show(score);
35. 35.💾 What number does this code show?
    let songs = ["Kites", "Sunrise", "Monsoon"];
    songs.push("Rain");
    songs.push("Stars");
    show(songs.length);
36. 36.💾 What number does this code show?
    let friends = ["Meera", "Riya", "Arjun"];
    friends.push("Zoya");
    show(friends.length);
37. 37.💾 What number does this code show?
    let notes = ["Sports", "Hindi", "Music", "Art"];
    notes.push("Maths");
    show(notes.length);
38. 38.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the phone is lost (c) you send a message (d) the app is closed
39. 39.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
40. 40.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Kites", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Monsoon (c) Kites

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