App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 537 · 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.💾 What number does this code show?
   let lives = 6;
   lives = lives - 2;
   lives = lives + 3;
   show(lives);
2. 2.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) your last game level (d) chat messages to friends
3. 3.💾 What does this code show? (Positions start at 0.)
   let notes = ["Music", "Art", "Sports", "Maths", "Hindi"];
   show(notes[3]); (a) Music (b) Sports (c) Art (d) Maths
4. 4.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
5. 5.💾 What does this code show? (Positions start at 0.)
   let friends = ["Kabir", "Aman", "Zoya", "Arjun"];
   show(friends[1]); (a) Kabir (b) Aman (c) Zoya (d) Arjun
6. 6.Which of these fits saving on the phone? (a) notes to read offline (b) a class leaderboard (c) a shared to-do list (d) chat messages to friends
7. 7.💾 pop() takes off the last item. What does this code show?
   let friends = ["Riya", "Meera", "Arjun", "Aman", "Zoya"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Arjun (b) Meera (c) Aman (d) Riya
8. 8.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a class leaderboard (c) your last game level (d) notes to read offline
9. 9.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
10. 10.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Hindi", "Art", "Sports"];
    show(notes[0]); (a) Hindi (b) Sports (c) Science (d) Art
11. 11.💾 What number does this code show?
    let notes = ["Maths", "Hindi", "Art", "Sports"];
    notes.push("Science");
    notes.push("Music");
    show(notes.length);
12. 12.Which of these fits saving in the cloud? (a) your last game level (b) a shared to-do list (c) the sound on/off setting (d) notes to read offline
13. 13.💾 What number does this code show?
    let lives = 5;
    lives = lives - 1;
    lives = lives + 3;
    show(lives);
14. 14.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
15. 15.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) use it on any device (c) never need a password (d) skip the internet
16. 16.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Sunrise", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Kites (c) Ocean
17. 17.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
18. 18.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) your last game level
19. 19.💾 What number does this code show?
    let friends = ["Aman", "Arjun"];
    friends.push("Riya");
    friends.push("Kabir");
    show(friends.length);
20. 20.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Art", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Art (c) Science
21. 21.Which of these fits saving on the phone? (a) your last game level (b) a class leaderboard (c) a shared to-do list (d) photos on two devices
22. 22.True or false: your last game level fits saving on the phone. (a) False (b) True
23. 23.💾 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
24. 24.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
25. 25.💾 What number does this code show?
    let score = 7;
    score = score - 2;
    score = score + 3;
    show(score);
26. 26.💾 What number does this code show?
    let friends = ["Meera", "Arjun", "Kabir", "Riya"];
    friends.push("Aman");
    show(friends.length);
27. 27.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Maths", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Maths (c) Art
28. 28.True or false: your last game level fits saving in the cloud. (a) True (b) False
29. 29.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
30. 30.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Maths", "Sports", "Art"];
    show(notes[3]); (a) Maths (b) Sports (c) Music (d) Art
31. 31.True or false: notes to read offline fits saving on the phone. (a) False (b) True
32. 32.💾 What number does this code show?
    let friends = ["Meera", "Kabir", "Aman", "Riya"];
    friends.push("Zoya");
    friends.push("Arjun");
    show(friends.length);
33. 33.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
34. 34.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
35. 35.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
36. 36.Which of these fits saving on the phone? (a) a class leaderboard (b) photos on two devices (c) a draft you are typing (d) a shared to-do list
37. 37.💾 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
38. 38.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Kites", "Ocean", "Rain", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Sunrise (c) Ocean (d) Rain
39. 39.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) photos on two devices (d) the sound on/off setting
40. 40.💾 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

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