App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 247 · 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 your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.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
3. 3.💾 What number does this code show?
   let stars = 4;
   stars = stars - 2;
   stars = stars + 4;
   show(stars);
4. 4.💾 What does this code show? (Positions start at 0.)
   let notes = ["Art", "Music", "Maths"];
   show(notes[1]); (a) Art (b) Music (c) Maths
5. 5.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Science", "Art", "Sports", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Sports (b) Music (c) Art (d) Science
6. 6.💾 What does this code show? (Positions start at 0.)
   let songs = ["Monsoon", "Ocean", "Kites", "Sunrise", "Stars"];
   show(songs[4]); (a) Ocean (b) Stars (c) Monsoon (d) Kites
7. 7.💾 What does this code show? (Positions start at 0.)
   let friends = ["Riya", "Zoya", "Aman", "Arjun"];
   show(friends[3]); (a) Riya (b) Zoya (c) Arjun (d) Aman
8. 8.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
9. 9.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the phone is lost (c) the screen turns off (d) the app is closed
10. 10.Which of these fits saving in the cloud? (a) your last game level (b) a class leaderboard (c) notes to read offline (d) the sound on/off setting
11. 11.💾 What number does this code show?
    let notes = ["Sports", "Music"];
    notes.push("Art");
    notes.push("Maths");
    show(notes.length);
12. 12.💾 Which can hold many values in order? (a) a switch (b) a button (c) a list (d) a single number
13. 13.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Zoya", "Aman", "Meera", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Aman (c) Meera (d) Arjun
14. 14.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) a shared chat (d) data saved on the phone
15. 15.💾 What number does this code show?
    let songs = ["Kites", "Monsoon", "Stars"];
    songs.push("Sunrise");
    show(songs.length);
16. 16.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) a shared to-do list (d) notes to read offline
17. 17.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) use it on any device (d) never need a password
18. 18.💾 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
19. 19.💾 What is a variable? (a) a type of screen (b) a picture (c) a named box for a value (d) a phone setting
20. 20.Which of these fits saving in the cloud? (a) a shared to-do list (b) a draft you are typing (c) the sound on/off setting (d) your last game level
21. 21.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Stars", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Rain (c) Kites
22. 22.Which of these fits saving on the phone? (a) the sound on/off setting (b) chat messages to friends (c) photos on two devices (d) a class leaderboard
23. 23.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
24. 24.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Hindi", "Sports", "Art", "Maths"];
    show(notes[3]); (a) Art (b) Music (c) Hindi (d) Sports
25. 25.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Monsoon", "Stars", "Ocean"];
    show(songs[0]); (a) Stars (b) Sunrise (c) Monsoon (d) Ocean
26. 26.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
27. 27.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Riya", "Zoya", "Arjun"];
    show(friends[2]); (a) Aman (b) Meera (c) Zoya (d) Riya
28. 28.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Monsoon", "Ocean", "Kites", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Ocean (c) Rain (d) Kites
29. 29.Which of these fits saving on the phone? (a) chat messages to friends (b) a shared to-do list (c) your last game level (d) a class leaderboard
30. 30.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Sports", "Art", "Maths", "Hindi"];
    show(notes[0]); (a) Maths (b) Art (c) Sports (d) Music
32. 32.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Zoya", "Aman"];
    show(friends[2]); (a) Zoya (b) Kabir (c) Aman
33. 33.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Sunrise", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Stars (c) Ocean
34. 34.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) a draft you are typing (d) photos on two devices
35. 35.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
36. 36.💾 What number does this code show?
    let points = 8;
    points = points - 4;
    points = points + 5;
    show(points);
37. 37.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Kites", "Stars", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Rain (c) Stars (d) Kites
38. 38.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Monsoon", "Kites", "Rain"];
    show(songs[3]); (a) Sunrise (b) Kites (c) Rain (d) Monsoon
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Maths", "Sports", "Art"];
    show(notes[0]); (a) Sports (b) Art (c) Hindi (d) Maths
40. 40.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 10 (c) 0 (d) 1

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