App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 111 · 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) notes to read offline (b) chat messages to friends (c) a class leaderboard (d) a shared to-do list
2. 2.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
3. 3.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud backup (c) a shared chat (d) a cloud leaderboard
4. 4.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 0 (c) 10 (d) 1
5. 5.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
6. 6.💾 Which can hold many values in order? (a) a switch (b) a button (c) a list (d) a single number
7. 7.💾 What number does this code show?
   let friends = ["Kabir", "Meera"];
   friends.push("Riya");
   show(friends.length);
8. 8.💾 pop() takes off the last item. What does this code show?
   let notes = ["Science", "Sports", "Art", "Music", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Science (b) Art (c) Music (d) Sports
9. 9.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) your last game level (d) a draft you are typing
10. 10.💾 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
11. 11.💾 What number does this code show?
    let notes = ["Sports", "Hindi"];
    notes.push("Science");
    show(notes.length);
12. 12.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
13. 13.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
14. 14.💾 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
15. 15.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
16. 16.💾 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
17. 17.💾 pop() takes off the last item. What does this code show?
    let friends = ["Zoya", "Riya", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Meera (c) Riya
18. 18.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Music", "Hindi"];
    show(notes[3]); (a) Music (b) Art (c) Hindi (d) Maths
19. 19.💾 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
20. 20.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
21. 21.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) the sound on/off setting (d) photos on two devices
22. 22.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Rain", "Ocean"];
    show(songs[2]); (a) Monsoon (b) Ocean (c) Rain
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.💾 What number does this code show?
    let coins = 3;
    coins = coins - 2;
    coins = coins + 4;
    show(coins);
25. 25.Which of these fits saving on the phone? (a) a draft you are typing (b) a shared to-do list (c) photos on two devices (d) chat messages to friends
26. 26.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
27. 27.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Art", "Maths", "Hindi"];
    show(notes[3]); (a) Art (b) Maths (c) Hindi (d) Music
28. 28.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
29. 29.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) photos on two devices (d) the sound on/off setting
30. 30.True or false: notes to read offline fits saving on the phone. (a) True (b) False
31. 31.💾 What number does this code show?
    let songs = ["Sunrise", "Stars", "Ocean"];
    songs.push("Rain");
    songs.push("Monsoon");
    show(songs.length);
32. 32.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
33. 33.💾 What number does this code show?
    let coins = 6;
    coins = coins - 2;
    coins = coins + 1;
    show(coins);
34. 34.Which of these fits saving in the cloud? (a) a class leaderboard (b) your last game level (c) the sound on/off setting (d) notes to read offline
35. 35.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Meera", "Zoya", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Riya (c) Arjun (d) Zoya
36. 36.True or false: your last game level fits saving on the phone. (a) False (b) True
37. 37.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Arjun", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Meera (c) Riya
38. 38.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Stars", "Kites", "Sunrise", "Monsoon"];
    show(songs[2]); (a) Sunrise (b) Stars (c) Kites (d) Rain
39. 39.💾 What is a variable? (a) a phone setting (b) a named box for a value (c) a picture (d) a type of screen
40. 40.💾 What number does this code show?
    let songs = ["Kites", "Monsoon", "Sunrise"];
    songs.push("Rain");
    show(songs.length);

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students