App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 933 · 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.True or false: your last game level fits saving on the phone. (a) False (b) True
2. 2.💾 What is a variable? (a) a picture (b) a named box for a value (c) a phone setting (d) a type of screen
3. 3.💾 What number does this code show?
   let notes = ["Sports", "Hindi"];
   notes.push("Maths");
   notes.push("Music");
   show(notes.length);
4. 4.💾 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
5. 5.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) the sound on/off setting (d) chat messages to friends
6. 6.💾 What does this code show? (Positions start at 0.)
   let notes = ["Maths", "Art", "Hindi", "Music"];
   show(notes[2]); (a) Music (b) Maths (c) Art (d) Hindi
7. 7.💾 pop() takes off the last item. What does this code show?
   let songs = ["Kites", "Monsoon", "Stars"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Monsoon (b) Kites (c) Stars
8. 8.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
9. 9.Which of these fits saving on the phone? (a) chat messages to friends (b) a draft you are typing (c) a class leaderboard (d) a shared to-do list
10. 10.Which of these fits saving in the cloud? (a) chat messages to friends (b) a draft you are typing (c) notes to read offline (d) the sound on/off setting
11. 11.💾 What number does this code show?
    let coins = 3;
    coins = coins - 3;
    coins = coins + 4;
    show(coins);
12. 12.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
13. 13.💾 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
14. 14.💾 What number does this code show?
    let score = 6;
    score = score - 1;
    score = score + 2;
    show(score);
15. 15.True or false: photos on two devices fits saving on the phone. (a) True (b) False
16. 16.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Riya", "Arjun", "Zoya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Zoya (c) Meera (d) Arjun
17. 17.True or false: your last game level fits saving in the cloud. (a) True (b) False
18. 18.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
19. 19.💾 Which works with no internet at all? (a) a cloud backup (b) a cloud leaderboard (c) a shared chat (d) data saved on the phone
20. 20.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Riya", "Arjun"];
    show(friends[2]); (a) Riya (b) Arjun (c) Meera
21. 21.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
22. 22.💾 What number does this code show?
    let lives = 8;
    lives = lives - 2;
    lives = lives + 2;
    show(lives);
23. 23.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
24. 24.💾 What number does this code show?
    let notes = ["Sports", "Music"];
    notes.push("Hindi");
    show(notes.length);
25. 25.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
26. 26.💾 What number does this code show?
    let notes = ["Hindi", "Science"];
    notes.push("Art");
    show(notes.length);
27. 27.💾 What number does this code show?
    let lives = 3;
    lives = lives - 1;
    lives = lives + 1;
    show(lives);
28. 28.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 1 (c) 2 (d) 0
29. 29.💾 What number does this code show?
    let lives = 9;
    lives = lives - 3;
    lives = lives + 1;
    show(lives);
30. 30.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Hindi", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Art (c) Science
31. 31.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
32. 32.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
33. 33.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Science", "Music"];
    show(notes[1]); (a) Science (b) Art (c) Music
34. 34.💾 What number does this code show?
    let songs = ["Sunrise", "Stars", "Monsoon"];
    songs.push("Rain");
    show(songs.length);
35. 35.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) your last game level
36. 36.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) skip the internet (c) shrink the app (d) never need a password
37. 37.💾 What number does this code show?
    let points = 7;
    points = points - 5;
    points = points + 1;
    show(points);
38. 38.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Science", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Maths (c) Music
39. 39.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
40. 40.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Zoya", "Meera", "Kabir", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Kabir (b) Aman (c) Zoya (d) Meera

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