App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 57 · 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.💾 What does this code show? (Positions start at 0.)
   let friends = ["Arjun", "Aman", "Kabir", "Zoya", "Meera"];
   show(friends[4]); (a) Kabir (b) Aman (c) Meera (d) Arjun
2. 2.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
3. 3.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) use it on any device (d) never need a password
4. 4.💾 What number does this code show?
   let notes = ["Sports", "Science", "Music"];
   notes.push("Art");
   show(notes.length);
5. 5.💾 What does this code show? (Positions start at 0.)
   let friends = ["Riya", "Meera", "Aman"];
   show(friends[1]); (a) Aman (b) Meera (c) Riya
6. 6.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
7. 7.💾 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
8. 8.💾 What does this code show? (Positions start at 0.)
   let notes = ["Maths", "Music", "Hindi", "Sports"];
   show(notes[2]); (a) Music (b) Sports (c) Hindi (d) Maths
9. 9.💾 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
10. 10.Which of these fits saving in the cloud? (a) chat messages to friends (b) your last game level (c) notes to read offline (d) the sound on/off setting
11. 11.💾 What is a variable? (a) a phone setting (b) a picture (c) a named box for a value (d) a type of screen
12. 12.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) the sound on/off setting (d) photos on two devices
13. 13.💾 What number does this code show?
    let points = 7;
    points = points - 7;
    points = points + 4;
    show(points);
14. 14.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) notes to read offline (d) photos on two devices
15. 15.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) a shared to-do list (d) a draft you are typing
16. 16.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
17. 17.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) a draft you are typing (d) a class leaderboard
18. 18.💾 What number does this code show?
    let stars = 3;
    stars = stars - 1;
    stars = stars + 1;
    show(stars);
19. 19.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Ocean", "Stars", "Sunrise"];
    show(songs[0]); (a) Ocean (b) Sunrise (c) Stars (d) Monsoon
20. 20.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Hindi", "Sports", "Science"];
    show(notes[0]); (a) Hindi (b) Art (c) Science (d) Sports
22. 22.True or false: your last game level fits saving in the cloud. (a) False (b) True
23. 23.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
24. 24.💾 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
25. 25.💾 What number does this code show?
    let notes = ["Music", "Science", "Maths", "Art"];
    notes.push("Sports");
    show(notes.length);
26. 26.Which of these fits saving on the phone? (a) a shared to-do list (b) notes to read offline (c) chat messages to friends (d) a class leaderboard
27. 27.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
28. 28.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
29. 29.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a shared chat (c) a cloud backup (d) data saved on the phone
30. 30.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
31. 31.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
32. 32.True or false: notes to read offline fits saving on the phone. (a) True (b) False
33. 33.💾 What number does this code show?
    let points = 8;
    points = points - 6;
    points = points + 4;
    show(points);
34. 34.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Kabir", "Arjun", "Riya"];
    show(friends[0]); (a) Kabir (b) Arjun (c) Zoya (d) Riya
35. 35.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
36. 36.💾 What number does this code show?
    let friends = ["Kabir", "Arjun", "Aman", "Meera"];
    friends.push("Riya");
    friends.push("Zoya");
    show(friends.length);
37. 37.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Arjun", "Zoya", "Meera"];
    show(friends[0]); (a) Zoya (b) Arjun (c) Meera (d) Kabir
38. 38.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Ocean", "Monsoon"];
    show(songs[0]); (a) Monsoon (b) Ocean (c) Stars
39. 39.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Kabir", "Aman", "Zoya", "Meera"];
    show(friends[2]); (a) Riya (b) Kabir (c) Zoya (d) Aman
40. 40.True or false: your last game level fits saving on the phone. (a) True (b) False

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