App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 884 · 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.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.True or false: photos on two devices fits saving on the phone. (a) False (b) True
3. 3.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
4. 4.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
5. 5.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
6. 6.💾 pop() takes off the last item. What does this code show?
   let songs = ["Sunrise", "Ocean", "Monsoon", "Stars", "Rain"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Sunrise (b) Monsoon (c) Ocean (d) Stars
7. 7.💾 pop() takes off the last item. What does this code show?
   let notes = ["Sports", "Science", "Art"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Sports (b) Science (c) Art
8. 8.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
9. 9.💾 What is a variable? (a) a picture (b) a type of screen (c) a named box for a value (d) a phone setting
10. 10.💾 Which works with no internet at all? (a) data saved on the phone (b) a shared chat (c) a cloud backup (d) a cloud leaderboard
11. 11.💾 What number does this code show?
    let score = 8;
    score = score - 4;
    score = score + 4;
    show(score);
12. 12.Which of these fits saving on the phone? (a) chat messages to friends (b) the sound on/off setting (c) photos on two devices (d) a class leaderboard
13. 13.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
14. 14.💾 What number does this code show?
    let songs = ["Sunrise", "Ocean", "Kites", "Rain"];
    songs.push("Monsoon");
    show(songs.length);
15. 15.💾 What number does this code show?
    let coins = 5;
    coins = coins - 2;
    coins = coins + 1;
    show(coins);
16. 16.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
17. 17.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Hindi"];
    show(notes[0]); (a) Hindi (b) Art (c) Maths
18. 18.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
19. 19.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
20. 20.💾 What number does this code show?
    let songs = ["Ocean", "Kites"];
    songs.push("Stars");
    show(songs.length);
21. 21.💾 What number does this code show?
    let notes = ["Hindi", "Music"];
    notes.push("Science");
    show(notes.length);
22. 22.💾 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
23. 23.True or false: your last game level fits saving in the cloud. (a) False (b) True
24. 24.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Science", "Maths"];
    show(notes[2]); (a) Science (b) Art (c) Maths
25. 25.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) shrink the app (d) skip the internet
26. 26.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
27. 27.💾 What number does this code show?
    let stars = 3;
    stars = stars - 2;
    stars = stars + 2;
    show(stars);
28. 28.💾 Which can hold many values in order? (a) a list (b) a button (c) a single number (d) a switch
29. 29.Which of these fits saving in the cloud? (a) a shared to-do list (b) notes to read offline (c) a draft you are typing (d) your last game level
30. 30.True or false: notes to read offline fits saving on the phone. (a) False (b) True
31. 31.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
32. 32.💾 What number does this code show?
    let coins = 8;
    coins = coins - 7;
    coins = coins + 5;
    show(coins);
33. 33.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 10 (c) 2 (d) 1
34. 34.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the phone is lost (d) the screen turns off
35. 35.💾 What number does this code show?
    let coins = 8;
    coins = coins - 6;
    coins = coins + 5;
    show(coins);
36. 36.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
37. 37.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
38. 38.💾 What number does this code show?
    let score = 3;
    score = score - 2;
    score = score + 3;
    show(score);
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Sports", "Art"];
    show(notes[0]); (a) Art (b) Maths (c) Hindi (d) Sports
40. 40.💾 What number does this code show?
    let score = 4;
    score = score - 4;
    score = score + 2;
    show(score);

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