App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 418 · 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) chat messages to friends (c) notes to read offline (d) a draft you are typing
2. 2.💾 What does this code show? (Positions start at 0.)
   let friends = ["Kabir", "Meera", "Riya", "Arjun"];
   show(friends[2]); (a) Riya (b) Kabir (c) Arjun (d) Meera
3. 3.💾 Which works with no internet at all? (a) a cloud backup (b) data saved on the phone (c) a shared chat (d) a cloud leaderboard
4. 4.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
5. 5.💾 What does this code show? (Positions start at 0.)
   let friends = ["Riya", "Aman", "Arjun", "Zoya", "Kabir"];
   show(friends[0]); (a) Riya (b) Zoya (c) Arjun (d) Aman
6. 6.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
7. 7.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
8. 8.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
9. 9.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
10. 10.True or false: your last game level fits saving in the cloud. (a) False (b) True
11. 11.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Sunrise", "Ocean", "Kites", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Sunrise (c) Kites (d) Ocean
12. 12.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Rain", "Monsoon", "Sunrise", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Rain (c) Sunrise (d) Monsoon
13. 13.💾 What is a variable? (a) a phone setting (b) a type of screen (c) a picture (d) a named box for a value
14. 14.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Science", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Science (d) Maths
16. 16.True or false: your last game level fits saving on the phone. (a) True (b) False
17. 17.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Science", "Art", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Sports (d) Music
18. 18.💾 What number does this code show?
    let score = 3;
    score = score - 2;
    score = score + 1;
    show(score);
19. 19.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Ocean", "Kites"];
    show(songs[2]); (a) Ocean (b) Monsoon (c) Kites
20. 20.💾 What number does this code show?
    let score = 3;
    score = score - 2;
    score = score + 3;
    show(score);
21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Hindi", "Music", "Science"];
    show(notes[2]); (a) Hindi (b) Maths (c) Art (d) Music
22. 22.💾 What number does this code show?
    let coins = 5;
    coins = coins - 1;
    coins = coins + 1;
    show(coins);
23. 23.Which of these fits saving in the cloud? (a) the sound on/off setting (b) photos on two devices (c) notes to read offline (d) a draft you are typing
24. 24.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) never need a password (d) skip the internet
25. 25.💾 What number does this code show?
    let points = 3;
    points = points - 3;
    points = points + 4;
    show(points);
26. 26.Which of these fits saving on the phone? (a) your last game level (b) chat messages to friends (c) photos on two devices (d) a class leaderboard
27. 27.💾 What number does this code show?
    let stars = 5;
    stars = stars - 3;
    stars = stars + 2;
    show(stars);
28. 28.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) the sound on/off setting (d) a shared to-do list
29. 29.💾 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
30. 30.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Sports", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Maths (c) Sports
31. 31.💾 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
32. 32.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Monsoon", "Stars"];
    show(songs[1]); (a) Stars (b) Monsoon (c) Ocean
33. 33.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
34. 34.💾 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
35. 35.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
36. 36.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Rain", "Stars", "Monsoon", "Ocean"];
    show(songs[4]); (a) Stars (b) Ocean (c) Sunrise (d) Rain
37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Maths", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Maths (c) Art
38. 38.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Sports", "Music", "Maths"];
    show(notes[2]); (a) Sports (b) Maths (c) Hindi (d) Music
40. 40.💾 What number does this code show?
    let friends = ["Riya", "Arjun", "Aman"];
    friends.push("Meera");
    friends.push("Zoya");
    show(friends.length);

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