App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 523 · 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.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) the screen turns off (c) the phone is lost (d) you send a message
2. 2.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
3. 3.💾 What does this code show? (Positions start at 0.)
   let friends = ["Meera", "Arjun", "Zoya", "Aman"];
   show(friends[1]); (a) Meera (b) Arjun (c) Aman (d) Zoya
4. 4.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
5. 5.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Art", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Music (b) Art (c) Hindi
6. 6.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
7. 7.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) photos on two devices (d) your last game level
8. 8.💾 What number does this code show?
   let coins = 5;
   coins = coins - 3;
   coins = coins + 5;
   show(coins);
9. 9.💾 What does this code show? (Positions start at 0.)
   let notes = ["Music", "Hindi", "Science", "Art", "Maths"];
   show(notes[2]); (a) Art (b) Music (c) Science (d) Hindi
10. 10.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
11. 11.💾 What number does this code show?
    let friends = ["Riya", "Zoya"];
    friends.push("Aman");
    show(friends.length);
12. 12.💾 What number does this code show?
    let songs = ["Kites", "Sunrise", "Rain", "Monsoon"];
    songs.push("Stars");
    show(songs.length);
13. 13.💾 What number does this code show?
    let stars = 8;
    stars = stars - 2;
    stars = stars + 1;
    show(stars);
14. 14.💾 What number does this code show?
    let songs = ["Kites", "Stars", "Sunrise", "Rain"];
    songs.push("Ocean");
    show(songs.length);
15. 15.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Sports", "Maths", "Science"];
    show(notes[2]); (a) Maths (b) Science (c) Sports (d) Hindi
16. 16.True or false: your last game level fits saving in the cloud. (a) True (b) False
17. 17.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
18. 18.💾 What number does this code show?
    let friends = ["Meera", "Zoya", "Riya"];
    friends.push("Arjun");
    show(friends.length);
19. 19.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Aman", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Kabir (c) Aman
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.💾 What is a variable? (a) a type of screen (b) a phone setting (c) a picture (d) a named box for a value
22. 22.💾 Which can hold many values in order? (a) a button (b) a single number (c) a switch (d) a list
23. 23.💾 What number does this code show?
    let points = 6;
    points = points - 1;
    points = points + 2;
    show(points);
24. 24.Which of these fits saving on the phone? (a) the sound on/off setting (b) photos on two devices (c) chat messages to friends (d) a shared to-do list
25. 25.Which of these fits saving in the cloud? (a) your last game level (b) a shared to-do list (c) notes to read offline (d) a draft you are typing
26. 26.Which of these fits saving in the cloud? (a) a class leaderboard (b) notes to read offline (c) a draft you are typing (d) the sound on/off setting
27. 27.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
28. 28.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
29. 29.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
30. 30.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Science", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Science (c) Sports
31. 31.💾 What number does this code show?
    let coins = 3;
    coins = coins - 3;
    coins = coins + 4;
    show(coins);
32. 32.💾 What number does this code show?
    let songs = ["Sunrise", "Ocean", "Kites"];
    songs.push("Monsoon");
    show(songs.length);
33. 33.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
34. 34.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
35. 35.💾 What number does this code show?
    let friends = ["Zoya", "Arjun", "Kabir", "Riya"];
    friends.push("Meera");
    show(friends.length);
36. 36.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) a class leaderboard (d) a draft you are typing
37. 37.💾 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
38. 38.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
39. 39.💾 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
40. 40.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) photos on two devices (d) your last game level

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