App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 303 · 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 in the cloud? (a) your last game level (b) the sound on/off setting (c) a shared to-do list (d) a draft you are typing
2. 2.💾 What number does this code show?
   let notes = ["Maths", "Science", "Art", "Hindi"];
   notes.push("Music");
   show(notes.length);
3. 3.Which of these fits saving on the phone? (a) the sound on/off setting (b) a shared to-do list (c) a class leaderboard (d) photos on two devices
4. 4.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
5. 5.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
6. 6.True or false: photos on two devices fits saving on the phone. (a) False (b) True
7. 7.💾 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
8. 8.💾 What number does this code show?
   let coins = 7;
   coins = coins - 7;
   coins = coins + 4;
   show(coins);
9. 9.💾 What number does this code show?
   let points = 9;
   points = points - 4;
   points = points + 2;
   show(points);
10. 10.💾 What number does this code show?
    let notes = ["Sports", "Art", "Science"];
    notes.push("Music");
    notes.push("Hindi");
    show(notes.length);
11. 11.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) the screen turns off (c) the phone is lost (d) you send a message
12. 12.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) notes to read offline (d) chat messages to friends
13. 13.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
14. 14.True or false: your last game level fits saving on the phone. (a) False (b) True
15. 15.💾 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
16. 16.💾 What number does this code show?
    let notes = ["Art", "Sports", "Maths", "Music"];
    notes.push("Hindi");
    show(notes.length);
17. 17.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) a shared chat (d) data saved on the phone
18. 18.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Kites", "Ocean", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Kites (d) Rain
19. 19.💾 What number does this code show?
    let friends = ["Riya", "Aman", "Zoya", "Arjun"];
    friends.push("Meera");
    friends.push("Kabir");
    show(friends.length);
20. 20.💾 What number does this code show?
    let score = 9;
    score = score - 2;
    score = score + 4;
    show(score);
21. 21.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
22. 22.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Music", "Art", "Maths", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Art (c) Music (d) Maths
23. 23.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
24. 24.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
25. 25.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Music", "Art", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Sports (c) Music (d) Art
26. 26.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
27. 27.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
28. 28.💾 What number does this code show?
    let friends = ["Riya", "Meera", "Aman"];
    friends.push("Zoya");
    friends.push("Arjun");
    show(friends.length);
29. 29.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a list (d) a button
30. 30.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 0 (c) 10 (d) 1
31. 31.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Hindi", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Hindi (c) Maths (d) Art
32. 32.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
33. 33.💾 What number does this code show?
    let notes = ["Hindi", "Maths", "Music", "Sports"];
    notes.push("Art");
    show(notes.length);
34. 34.💾 What number does this code show?
    let stars = 3;
    stars = stars - 2;
    stars = stars + 5;
    show(stars);
35. 35.True or false: notes to read offline fits saving on the phone. (a) True (b) False
36. 36.💾 What is a variable? (a) a named box for a value (b) a picture (c) a phone setting (d) a type of screen
37. 37.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) a shared to-do list (d) your last game level
38. 38.True or false: your last game level fits saving in the cloud. (a) True (b) False
39. 39.💾 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
40. 40.Which of these fits saving in the cloud? (a) a draft you are typing (b) the sound on/off setting (c) notes to read offline (d) chat messages to friends

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