App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 174 · 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.💾 Saving data in the cloud lets you ___. (a) never need a password (b) use it on any device (c) shrink the app (d) skip the internet
2. 2.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 1 (c) 2 (d) 10
3. 3.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a cloud backup (d) a shared chat
4. 4.True or false: your last game level fits saving in the cloud. (a) False (b) True
5. 5.True or false: notes to read offline fits saving on the phone. (a) False (b) True
6. 6.💾 What number does this code show?
   let points = 3;
   points = points - 2;
   points = points + 1;
   show(points);
7. 7.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
8. 8.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
9. 9.💾 What number does this code show?
   let points = 8;
   points = points - 2;
   points = points + 3;
   show(points);
10. 10.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
11. 11.💾 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
12. 12.💾 What number does this code show?
    let friends = ["Riya", "Arjun"];
    friends.push("Zoya");
    friends.push("Aman");
    show(friends.length);
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Sports", "Science", "Music", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Science (d) Music
14. 14.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Ocean", "Sunrise"];
    show(songs[0]); (a) Stars (b) Sunrise (c) Ocean
15. 15.💾 What number does this code show?
    let notes = ["Sports", "Art", "Music", "Hindi"];
    notes.push("Science");
    show(notes.length);
16. 16.💾 What is a variable? (a) a type of screen (b) a named box for a value (c) a picture (d) a phone setting
17. 17.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
18. 18.💾 pop() takes off the last item. What does this code show?
    let friends = ["Zoya", "Kabir", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Aman (c) Kabir
19. 19.💾 Which can hold many values in order? (a) a list (b) a switch (c) a button (d) a single number
20. 20.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
21. 21.Which of these fits saving on the phone? (a) your last game level (b) photos on two devices (c) chat messages to friends (d) a class leaderboard
22. 22.Which of these fits saving on the phone? (a) notes to read offline (b) a class leaderboard (c) chat messages to friends (d) a shared to-do list
23. 23.💾 What number does this code show?
    let score = 8;
    score = score - 4;
    score = score + 1;
    show(score);
24. 24.💾 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
25. 25.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Ocean", "Kites", "Monsoon"];
    show(songs[3]); (a) Sunrise (b) Kites (c) Monsoon (d) Ocean
26. 26.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) the sound on/off setting (d) a shared to-do list
27. 27.💾 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
28. 28.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Zoya", "Meera", "Kabir", "Riya"];
    show(friends[3]); (a) Kabir (b) Meera (c) Aman (d) Zoya
29. 29.💾 What number does this code show?
    let points = 4;
    points = points - 2;
    points = points + 1;
    show(points);
30. 30.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) the app is closed (c) you send a message (d) the screen turns off
31. 31.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
32. 32.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
33. 33.True or false: your last game level fits saving on the phone. (a) False (b) True
34. 34.💾 What number does this code show?
    let friends = ["Aman", "Zoya", "Meera"];
    friends.push("Kabir");
    friends.push("Arjun");
    show(friends.length);
35. 35.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Zoya"];
    show(friends[1]); (a) Meera (b) Zoya (c) Aman
36. 36.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Science", "Sports"];
    show(notes[2]); (a) Sports (b) Science (c) Hindi
37. 37.💾 What number does this code show?
    let notes = ["Science", "Maths", "Sports"];
    notes.push("Music");
    show(notes.length);
38. 38.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Meera", "Aman", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Meera (c) Zoya (d) Kabir
39. 39.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Ocean", "Sunrise", "Rain", "Monsoon"];
    show(songs[0]); (a) Ocean (b) Stars (c) Rain (d) Sunrise
40. 40.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Zoya", "Aman", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Zoya (c) Aman (d) Riya

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