App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 635 · 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) notes to read offline (b) a draft you are typing (c) the sound on/off setting (d) chat messages to friends
2. 2.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
3. 3.💾 What number does this code show?
   let points = 7;
   points = points - 4;
   points = points + 5;
   show(points);
4. 4.💾 What does this code show? (Positions start at 0.)
   let songs = ["Stars", "Sunrise", "Ocean", "Rain"];
   show(songs[3]); (a) Sunrise (b) Rain (c) Stars (d) Ocean
5. 5.True or false: notes to read offline fits saving on the phone. (a) False (b) True
6. 6.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a shared chat (d) a cloud backup
7. 7.💾 What does this code show? (Positions start at 0.)
   let songs = ["Rain", "Ocean", "Sunrise", "Monsoon"];
   show(songs[3]); (a) Rain (b) Monsoon (c) Ocean (d) Sunrise
8. 8.💾 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
9. 9.💾 What number does this code show?
   let notes = ["Music", "Science"];
   notes.push("Art");
   notes.push("Hindi");
   show(notes.length);
10. 10.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
11. 11.Which of these fits saving on the phone? (a) photos on two devices (b) notes to read offline (c) a class leaderboard (d) chat messages to friends
12. 12.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Zoya", "Aman"];
    show(friends[1]); (a) Aman (b) Meera (c) Zoya
13. 13.True or false: photos on two devices fits saving on the phone. (a) True (b) False
14. 14.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 10 (d) 0
15. 15.💾 What number does this code show?
    let points = 6;
    points = points - 5;
    points = points + 5;
    show(points);
16. 16.💾 What number does this code show?
    let friends = ["Meera", "Arjun", "Riya", "Aman"];
    friends.push("Kabir");
    show(friends.length);
17. 17.💾 What is a variable? (a) a picture (b) a phone setting (c) a named box for a value (d) a type of screen
18. 18.💾 What number does this code show?
    let notes = ["Sports", "Music", "Art"];
    notes.push("Maths");
    notes.push("Science");
    show(notes.length);
19. 19.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) a draft you are typing (d) a class leaderboard
20. 20.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
21. 21.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
22. 22.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) a draft you are typing (d) photos on two devices
23. 23.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) chat messages to friends (d) a shared to-do list
24. 24.💾 What number does this code show?
    let coins = 6;
    coins = coins - 6;
    coins = coins + 5;
    show(coins);
25. 25.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Zoya", "Meera", "Arjun", "Riya"];
    show(friends[4]); (a) Meera (b) Riya (c) Zoya (d) Aman
26. 26.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
27. 27.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Sports", "Hindi"];
    show(notes[0]); (a) Art (b) Maths (c) Hindi (d) Sports
28. 28.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
29. 29.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Kites", "Rain", "Ocean"];
    show(songs[0]); (a) Monsoon (b) Kites (c) Rain (d) Ocean
30. 30.Which of these fits saving in the cloud? (a) a shared to-do list (b) notes to read offline (c) the sound on/off setting (d) a draft you are typing
31. 31.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) chat messages to friends (d) your last game level
32. 32.💾 What number does this code show?
    let points = 8;
    points = points - 5;
    points = points + 3;
    show(points);
33. 33.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 2;
    show(score);
34. 34.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Maths", "Music", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Hindi (c) Music (d) Maths
35. 35.💾 What number does this code show?
    let coins = 4;
    coins = coins - 3;
    coins = coins + 3;
    show(coins);
36. 36.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Zoya", "Kabir", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Meera (c) Kabir (d) Zoya
37. 37.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
38. 38.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) use it on any device (d) never need a password
39. 39.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) a draft you are typing (d) a class leaderboard
40. 40.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False

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