App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 776 · 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) your last game level (b) notes to read offline (c) chat messages to friends (d) the sound on/off setting
2. 2.💾 What number does this code show?
   let notes = ["Science", "Music", "Art"];
   notes.push("Maths");
   notes.push("Sports");
   show(notes.length);
3. 3.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
4. 4.💾 What number does this code show?
   let songs = ["Kites", "Stars", "Rain"];
   songs.push("Monsoon");
   show(songs.length);
5. 5.Which of these fits saving on the phone? (a) photos on two devices (b) notes to read offline (c) chat messages to friends (d) a class leaderboard
6. 6.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) photos on two devices (d) a draft you are typing
7. 7.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
8. 8.💾 What number does this code show?
   let points = 8;
   points = points - 8;
   points = points + 2;
   show(points);
9. 9.True or false: your last game level fits saving in the cloud. (a) True (b) False
10. 10.💾 What number does this code show?
    let notes = ["Hindi", "Sports", "Maths", "Science"];
    notes.push("Music");
    notes.push("Art");
    show(notes.length);
11. 11.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) the sound on/off setting (d) a shared to-do list
12. 12.💾 What number does this code show?
    let lives = 8;
    lives = lives - 1;
    lives = lives + 1;
    show(lives);
13. 13.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Art", "Science", "Maths"];
    show(notes[0]); (a) Art (b) Science (c) Maths (d) Music
14. 14.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Science", "Hindi", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Hindi (c) Music (d) Science
15. 15.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) your last game level (d) a class leaderboard
16. 16.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
17. 17.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
18. 18.💾 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
19. 19.💾 What number does this code show?
    let points = 5;
    points = points - 3;
    points = points + 2;
    show(points);
20. 20.💾 What number does this code show?
    let coins = 3;
    coins = coins - 3;
    coins = coins + 5;
    show(coins);
21. 21.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
22. 22.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
23. 23.💾 What number does this code show?
    let friends = ["Riya", "Zoya", "Kabir", "Arjun"];
    friends.push("Meera");
    friends.push("Aman");
    show(friends.length);
24. 24.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Zoya", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Zoya (c) Meera
25. 25.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) skip the internet (d) shrink the app
27. 27.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Hindi", "Maths", "Science", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Science (d) Maths
28. 28.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Riya", "Arjun"];
    show(friends[0]); (a) Riya (b) Arjun (c) Meera (d) Aman
29. 29.Which of these fits saving in the cloud? (a) a draft you are typing (b) your last game level (c) notes to read offline (d) photos on two devices
30. 30.💾 What number does this code show?
    let score = 4;
    score = score - 1;
    score = score + 4;
    show(score);
31. 31.💾 What number does this code show?
    let friends = ["Arjun", "Riya", "Kabir"];
    friends.push("Meera");
    show(friends.length);
32. 32.True or false: your last game level fits saving on the phone. (a) True (b) False
33. 33.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Rain", "Ocean"];
    show(songs[0]); (a) Ocean (b) Rain (c) Stars
34. 34.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Rain", "Ocean"];
    show(songs[0]); (a) Rain (b) Ocean (c) Monsoon
35. 35.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 0 (c) 10 (d) 1
36. 36.Which of these fits saving in the cloud? (a) a draft you are typing (b) a class leaderboard (c) your last game level (d) the sound on/off setting
37. 37.💾 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
38. 38.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Stars", "Kites", "Monsoon", "Sunrise"];
    show(songs[3]); (a) Rain (b) Kites (c) Stars (d) Monsoon
39. 39.💾 What number does this code show?
    let points = 6;
    points = points - 4;
    points = points + 1;
    show(points);
40. 40.💾 What number does this code show?
    let stars = 6;
    stars = stars - 2;
    stars = stars + 1;
    show(stars);

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