App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 982 · 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.💾 Saving data in the cloud lets you ___. (a) never need a password (b) use it on any device (c) shrink the app (d) skip the internet
2. 2.💾 What is a variable? (a) a named box for a value (b) a picture (c) a type of screen (d) a phone setting
3. 3.💾 What number does this code show?
   let songs = ["Ocean", "Kites"];
   songs.push("Stars");
   songs.push("Sunrise");
   show(songs.length);
4. 4.💾 What number does this code show?
   let score = 3;
   score = score - 2;
   score = score + 5;
   show(score);
5. 5.💾 What number does this code show?
   let songs = ["Kites", "Rain", "Sunrise"];
   songs.push("Monsoon");
   show(songs.length);
6. 6.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
7. 7.💾 What number does this code show?
   let score = 3;
   score = score - 1;
   score = score + 2;
   show(score);
8. 8.💾 pop() takes off the last item. What does this code show?
   let friends = ["Arjun", "Zoya", "Meera", "Riya"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Arjun (b) Riya (c) Zoya (d) Meera
9. 9.💾 What number does this code show?
   let points = 4;
   points = points - 1;
   points = points + 2;
   show(points);
10. 10.💾 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
11. 11.Which of these fits saving in the cloud? (a) photos on two devices (b) your last game level (c) a draft you are typing (d) the sound on/off setting
12. 12.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
13. 13.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 3;
    show(score);
14. 14.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Sports", "Music", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Maths (c) Music (d) Sports
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.💾 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
18. 18.💾 What number does this code show?
    let score = 3;
    score = score - 3;
    score = score + 4;
    show(score);
19. 19.💾 What number does this code show?
    let score = 3;
    score = score - 2;
    score = score + 3;
    show(score);
20. 20.True or false: your last game level fits saving on the phone. (a) False (b) True
21. 21.Which of these fits saving in the cloud? (a) notes to read offline (b) a shared to-do list (c) a draft you are typing (d) the sound on/off setting
22. 22.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 2 (c) 1 (d) 0
23. 23.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
24. 24.💾 What number does this code show?
    let songs = ["Ocean", "Sunrise", "Rain"];
    songs.push("Kites");
    songs.push("Stars");
    show(songs.length);
25. 25.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
26. 26.💾 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
27. 27.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
28. 28.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
29. 29.💾 What number does this code show?
    let stars = 9;
    stars = stars - 5;
    stars = stars + 2;
    show(stars);
30. 30.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) data saved on the phone (d) a shared chat
31. 31.💾 What number does this code show?
    let songs = ["Kites", "Ocean"];
    songs.push("Rain");
    show(songs.length);
32. 32.💾 What number does this code show?
    let notes = ["Maths", "Science"];
    notes.push("Hindi");
    show(notes.length);
33. 33.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) chat messages to friends (d) your last game level
34. 34.💾 Which can hold many values in order? (a) a switch (b) a list (c) a single number (d) a button
35. 35.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) a draft you are typing (d) a class leaderboard
36. 36.💾 What number does this code show?
    let notes = ["Sports", "Music", "Hindi"];
    notes.push("Science");
    show(notes.length);
37. 37.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Hindi"];
    show(notes[2]); (a) Hindi (b) Maths (c) Music
39. 39.💾 What number does this code show?
    let friends = ["Zoya", "Kabir", "Meera", "Arjun"];
    friends.push("Riya");
    show(friends.length);
40. 40.Which of these fits saving in the cloud? (a) chat messages to friends (b) notes to read offline (c) the sound on/off setting (d) a draft you are typing

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