App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 768 · 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.💾 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
2. 2.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 10 (c) 2 (d) 0
3. 3.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
4. 4.💾 pop() takes off the last item. What does this code show?
   let songs = ["Monsoon", "Sunrise", "Kites"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Kites (b) Monsoon (c) Sunrise
5. 5.💾 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
6. 6.💾 What does this code show? (Positions start at 0.)
   let songs = ["Sunrise", "Stars", "Rain"];
   show(songs[1]); (a) Rain (b) Stars (c) Sunrise
7. 7.💾 What number does this code show?
   let score = 3;
   score = score - 2;
   score = score + 3;
   show(score);
8. 8.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
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.💾 What number does this code show?
    let friends = ["Meera", "Aman"];
    friends.push("Arjun");
    friends.push("Riya");
    show(friends.length);
11. 11.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
12. 12.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Hindi", "Science", "Art"];
    show(notes[1]); (a) Music (b) Science (c) Hindi (d) Maths
13. 13.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
14. 14.💾 Which works with no internet at all? (a) a shared chat (b) data saved on the phone (c) a cloud leaderboard (d) a cloud backup
15. 15.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
16. 16.Which of these fits saving on the phone? (a) a shared to-do list (b) the sound on/off setting (c) a class leaderboard (d) chat messages to friends
17. 17.💾 What number does this code show?
    let notes = ["Art", "Hindi", "Maths", "Science"];
    notes.push("Sports");
    show(notes.length);
18. 18.💾 What is a variable? (a) a picture (b) a named box for a value (c) a phone setting (d) a type of screen
19. 19.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
20. 20.Which of these fits saving in the cloud? (a) a draft you are typing (b) notes to read offline (c) a class leaderboard (d) your last game level
21. 21.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Kites", "Sunrise", "Rain"];
    show(songs[0]); (a) Sunrise (b) Ocean (c) Rain (d) Kites
22. 22.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
23. 23.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Maths", "Hindi", "Science"];
    show(notes[3]); (a) Maths (b) Music (c) Hindi (d) Science
24. 24.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
25. 25.💾 What number does this code show?
    let coins = 6;
    coins = coins - 2;
    coins = coins + 5;
    show(coins);
26. 26.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) the sound on/off setting
27. 27.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
28. 28.💾 What number does this code show?
    let songs = ["Monsoon", "Rain"];
    songs.push("Stars");
    show(songs.length);
29. 29.💾 Which can hold many values in order? (a) a single number (b) a button (c) a switch (d) a list
30. 30.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean"];
    songs.push("Rain");
    show(songs.length);
31. 31.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Zoya", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Zoya (c) Arjun
32. 32.💾 What number does this code show?
    let songs = ["Monsoon", "Rain"];
    songs.push("Ocean");
    show(songs.length);
33. 33.Which of these fits saving on the phone? (a) a class leaderboard (b) photos on two devices (c) chat messages to friends (d) notes to read offline
34. 34.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
35. 35.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) never need a password (d) use it on any device
36. 36.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) the screen turns off (c) you send a message (d) the phone is lost
37. 37.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Meera", "Arjun", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Meera (c) Riya (d) Aman
38. 38.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) your last game level (d) a class leaderboard
39. 39.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Meera", "Arjun", "Aman"];
    show(friends[2]); (a) Aman (b) Meera (c) Riya (d) Arjun
40. 40.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Monsoon", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Monsoon (c) Rain

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