App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 445 · 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 notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 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
3. 3.💾 What number does this code show?
   let points = 6;
   points = points - 6;
   points = points + 2;
   show(points);
4. 4.💾 What number does this code show?
   let songs = ["Ocean", "Rain", "Stars"];
   songs.push("Kites");
   show(songs.length);
5. 5.💾 What does this code show? (Positions start at 0.)
   let notes = ["Art", "Science", "Sports", "Maths", "Music"];
   show(notes[2]); (a) Maths (b) Sports (c) Art (d) Science
6. 6.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 0 (c) 2 (d) 10
7. 7.💾 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
8. 8.True or false: photos on two devices fits saving on the phone. (a) False (b) True
9. 9.💾 What does this code show? (Positions start at 0.)
   let songs = ["Rain", "Kites", "Monsoon", "Ocean", "Sunrise"];
   show(songs[0]); (a) Monsoon (b) Kites (c) Ocean (d) Rain
10. 10.💾 What number does this code show?
    let coins = 5;
    coins = coins - 3;
    coins = coins + 4;
    show(coins);
11. 11.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Zoya", "Riya"];
    show(friends[2]); (a) Arjun (b) Zoya (c) Riya
12. 12.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
13. 13.💾 Which can hold many values in order? (a) a single number (b) a button (c) a list (d) a switch
14. 14.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) photos on two devices (d) notes to read offline
15. 15.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
16. 16.💾 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
17. 17.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) your last game level (d) chat messages to friends
18. 18.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Sports", "Science", "Music"];
    show(notes[3]); (a) Art (b) Music (c) Science (d) Sports
19. 19.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Arjun", "Kabir", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Aman (c) Kabir (d) Arjun
20. 20.💾 What number does this code show?
    let stars = 5;
    stars = stars - 3;
    stars = stars + 5;
    show(stars);
21. 21.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Rain", "Kites"];
    show(songs[1]); (a) Sunrise (b) Kites (c) Rain
22. 22.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
23. 23.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Kabir", "Meera", "Riya", "Aman"];
    show(friends[4]); (a) Arjun (b) Kabir (c) Aman (d) Meera
24. 24.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Riya", "Zoya", "Arjun"];
    show(friends[0]); (a) Riya (b) Arjun (c) Aman (d) Zoya
25. 25.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) photos on two devices (d) a draft you are typing
26. 26.💾 What number does this code show?
    let notes = ["Art", "Sports"];
    notes.push("Hindi");
    show(notes.length);
27. 27.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Sunrise", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Monsoon (c) Kites
28. 28.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
29. 29.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) the sound on/off setting (d) a draft you are typing
30. 30.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
31. 31.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
32. 32.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Art", "Maths"];
    show(notes[1]); (a) Maths (b) Music (c) Art
33. 33.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
34. 34.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
35. 35.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Sports", "Music", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Music (c) Science (d) Sports
36. 36.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Monsoon", "Kites", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Stars (c) Monsoon (d) Ocean
37. 37.💾 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
38. 38.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a draft you are typing (c) your last game level (d) a class leaderboard
39. 39.💾 What is a variable? (a) a phone setting (b) a type of screen (c) a named box for a value (d) a picture
40. 40.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone

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