App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 822 · 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 works with no internet at all? (a) a cloud backup (b) a shared chat (c) a cloud leaderboard (d) data saved on the phone
2. 2.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
3. 3.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) notes to read offline
4. 4.💾 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
5. 5.💾 What number does this code show?
   let score = 5;
   score = score - 2;
   score = score + 4;
   show(score);
6. 6.💾 What number does this code show?
   let songs = ["Sunrise", "Ocean", "Rain", "Kites"];
   songs.push("Monsoon");
   show(songs.length);
7. 7.💾 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
8. 8.True or false: notes to read offline fits saving on the phone. (a) True (b) False
9. 9.💾 What number does this code show?
   let points = 9;
   points = points - 4;
   points = points + 4;
   show(points);
10. 10.💾 What number does this code show?
    let score = 6;
    score = score - 1;
    score = score + 3;
    show(score);
11. 11.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 2;
    show(score);
12. 12.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) chat messages to friends (d) notes to read offline
13. 13.True or false: your last game level fits saving in the cloud. (a) True (b) False
14. 14.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Music", "Art"];
    show(notes[1]); (a) Art (b) Sports (c) Music
15. 15.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
16. 16.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
17. 17.💾 What number does this code show?
    let friends = ["Kabir", "Arjun", "Aman", "Meera"];
    friends.push("Riya");
    show(friends.length);
18. 18.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Hindi", "Maths", "Music"];
    show(notes[4]); (a) Hindi (b) Sports (c) Science (d) Music
19. 19.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Monsoon", "Stars"];
    show(songs[1]); (a) Monsoon (b) Rain (c) Stars
20. 20.💾 Which can hold many values in order? (a) a list (b) a button (c) a single number (d) a switch
21. 21.💾 What number does this code show?
    let lives = 6;
    lives = lives - 1;
    lives = lives + 5;
    show(lives);
22. 22.Which of these fits saving on the phone? (a) a class leaderboard (b) a draft you are typing (c) photos on two devices (d) a shared to-do list
23. 23.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Ocean", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Stars (c) Ocean
24. 24.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Sunrise", "Ocean", "Stars"];
    show(songs[2]); (a) Rain (b) Stars (c) Ocean (d) Sunrise
25. 25.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
26. 26.💾 What number does this code show?
    let friends = ["Meera", "Riya"];
    friends.push("Arjun");
    show(friends.length);
27. 27.💾 pop() takes off the last item. What does this code show?
    let friends = ["Zoya", "Aman", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Riya (c) Aman
28. 28.💾 What is a variable? (a) a picture (b) a named box for a value (c) a type of screen (d) a phone setting
29. 29.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Aman", "Riya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Riya (c) Kabir (d) Meera
30. 30.💾 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
31. 31.💾 What number does this code show?
    let coins = 6;
    coins = coins - 1;
    coins = coins + 2;
    show(coins);
32. 32.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Rain", "Monsoon", "Ocean", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Monsoon (c) Sunrise (d) Ocean
33. 33.True or false: your last game level fits saving on the phone. (a) True (b) False
34. 34.💾 What number does this code show?
    let friends = ["Arjun", "Aman", "Zoya", "Riya"];
    friends.push("Kabir");
    show(friends.length);
35. 35.💾 What number does this code show?
    let friends = ["Kabir", "Meera", "Zoya", "Riya"];
    friends.push("Aman");
    show(friends.length);
36. 36.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Music", "Maths"];
    show(notes[1]); (a) Maths (b) Science (c) Music
37. 37.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
38. 38.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 10 (c) 1 (d) 2
39. 39.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
40. 40.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Science", "Music", "Hindi"];
    show(notes[1]); (a) Art (b) Music (c) Hindi (d) Science

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