App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 114 · 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.💾 What number does this code show?
   let score = 9;
   score = score - 3;
   score = score + 2;
   show(score);
3. 3.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
4. 4.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) a draft you are typing (d) a shared to-do list
5. 5.💾 What number does this code show?
   let points = 8;
   points = points - 4;
   points = points + 3;
   show(points);
6. 6.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) a draft you are typing (d) your last game level
7. 7.💾 What number does this code show?
   let notes = ["Sports", "Science", "Art"];
   notes.push("Music");
   notes.push("Maths");
   show(notes.length);
8. 8.💾 Which can hold many values in order? (a) a list (b) a switch (c) a single number (d) a button
9. 9.💾 What number does this code show?
   let notes = ["Science", "Art", "Hindi"];
   notes.push("Maths");
   show(notes.length);
10. 10.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
11. 11.💾 What number does this code show?
    let songs = ["Ocean", "Sunrise"];
    songs.push("Rain");
    songs.push("Stars");
    show(songs.length);
12. 12.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Aman", "Riya"];
    show(friends[2]); (a) Aman (b) Riya (c) Zoya
13. 13.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
14. 14.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) your last game level (d) a shared to-do list
15. 15.Which of these fits saving in the cloud? (a) photos on two devices (b) a draft you are typing (c) the sound on/off setting (d) notes to read offline
16. 16.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
17. 17.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
18. 18.💾 What number does this code show?
    let songs = ["Kites", "Sunrise", "Rain", "Ocean"];
    songs.push("Monsoon");
    songs.push("Stars");
    show(songs.length);
19. 19.💾 What number does this code show?
    let songs = ["Stars", "Monsoon"];
    songs.push("Kites");
    show(songs.length);
20. 20.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
21. 21.💾 Which works with no internet at all? (a) a shared chat (b) data saved on the phone (c) a cloud backup (d) a cloud leaderboard
22. 22.True or false: your last game level fits saving on the phone. (a) True (b) False
23. 23.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
24. 24.💾 What number does this code show?
    let songs = ["Rain", "Ocean", "Stars", "Sunrise"];
    songs.push("Monsoon");
    show(songs.length);
25. 25.True or false: your last game level fits saving in the cloud. (a) True (b) False
26. 26.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.💾 What number does this code show?
    let friends = ["Riya", "Meera"];
    friends.push("Kabir");
    friends.push("Arjun");
    show(friends.length);
28. 28.💾 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
29. 29.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Ocean", "Sunrise"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Ocean (c) Rain
30. 30.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Monsoon", "Rain", "Stars", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Stars (c) Rain (d) Sunrise
31. 31.💾 What number does this code show?
    let notes = ["Music", "Sports", "Art", "Science"];
    notes.push("Hindi");
    show(notes.length);
32. 32.💾 What number does this code show?
    let notes = ["Maths", "Science", "Art", "Sports"];
    notes.push("Music");
    notes.push("Hindi");
    show(notes.length);
33. 33.💾 What is a variable? (a) a picture (b) a type of screen (c) a named box for a value (d) a phone setting
34. 34.💾 What number does this code show?
    let points = 4;
    points = points - 2;
    points = points + 1;
    show(points);
35. 35.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
36. 36.💾 What number does this code show?
    let notes = ["Maths", "Science", "Hindi", "Music"];
    notes.push("Art");
    notes.push("Sports");
    show(notes.length);
37. 37.💾 What number does this code show?
    let notes = ["Maths", "Music", "Art", "Hindi"];
    notes.push("Sports");
    show(notes.length);
38. 38.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Maths", "Science", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Music (c) Art (d) Science
39. 39.True or false: photos on two devices fits saving on the phone. (a) False (b) True
40. 40.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Kites", "Ocean", "Monsoon"];
    show(songs[2]); (a) Ocean (b) Stars (c) Kites (d) Monsoon

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