App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 746 · 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: the sound on/off setting fits saving on the phone. (a) False (b) True
2. 2.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
3. 3.💾 What number does this code show?
   let notes = ["Hindi", "Art", "Music"];
   notes.push("Maths");
   notes.push("Sports");
   show(notes.length);
4. 4.True or false: your last game level fits saving on the phone. (a) False (b) True
5. 5.💾 pop() takes off the last item. What does this code show?
   let friends = ["Riya", "Zoya", "Kabir", "Aman"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Aman (b) Kabir (c) Zoya (d) Riya
6. 6.True or false: your last game level fits saving in the cloud. (a) False (b) True
7. 7.💾 What number does this code show?
   let songs = ["Rain", "Ocean", "Stars", "Kites"];
   songs.push("Sunrise");
   songs.push("Monsoon");
   show(songs.length);
8. 8.💾 What number does this code show?
   let score = 4;
   score = score - 3;
   score = score + 5;
   show(score);
9. 9.💾 What number does this code show?
   let stars = 8;
   stars = stars - 8;
   stars = stars + 1;
   show(stars);
10. 10.Which of these fits saving in the cloud? (a) a draft you are typing (b) photos on two devices (c) the sound on/off setting (d) notes to read offline
11. 11.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the screen turns off (d) the phone is lost
12. 12.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
13. 13.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
14. 14.True or false: notes to read offline fits saving on the phone. (a) False (b) True
15. 15.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Kites", "Ocean"];
    show(songs[1]); (a) Kites (b) Ocean (c) Monsoon
16. 16.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
17. 17.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
18. 18.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a shared chat (d) a cloud backup
19. 19.💾 What number does this code show?
    let coins = 4;
    coins = coins - 4;
    coins = coins + 2;
    show(coins);
20. 20.💾 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
21. 21.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) a class leaderboard (d) the sound on/off setting
22. 22.True or false: photos on two devices fits saving on the phone. (a) True (b) False
23. 23.💾 Which can hold many values in order? (a) a list (b) a switch (c) a single number (d) a button
24. 24.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Meera", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Riya (c) Meera
25. 25.💾 What number does this code show?
    let notes = ["Maths", "Hindi", "Art"];
    notes.push("Science");
    show(notes.length);
26. 26.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
27. 27.💾 What number does this code show?
    let friends = ["Zoya", "Kabir", "Meera"];
    friends.push("Arjun");
    show(friends.length);
28. 28.💾 What number does this code show?
    let score = 8;
    score = score - 6;
    score = score + 1;
    show(score);
29. 29.💾 What is a variable? (a) a type of screen (b) a picture (c) a named box for a value (d) a phone setting
30. 30.Which of these fits saving in the cloud? (a) a draft you are typing (b) chat messages to friends (c) notes to read offline (d) your last game level
31. 31.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
32. 32.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
33. 33.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Hindi"];
    show(notes[1]); (a) Art (b) Hindi (c) Maths
34. 34.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Sunrise", "Rain", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Sunrise (c) Ocean (d) Kites
35. 35.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 0 (c) 10 (d) 2
36. 36.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Sports", "Science", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Music (d) Sports
37. 37.💾 What number does this code show?
    let stars = 8;
    stars = stars - 2;
    stars = stars + 2;
    show(stars);
38. 38.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
39. 39.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Ocean", "Stars", "Monsoon", "Sunrise"];
    show(songs[1]); (a) Rain (b) Stars (c) Ocean (d) Monsoon
40. 40.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) notes to read offline (d) a class leaderboard

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