App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 245 · 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 the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 What number does this code show?
   let points = 4;
   points = points - 1;
   points = points + 2;
   show(points);
3. 3.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
4. 4.💾 Which can hold many values in order? (a) a switch (b) a list (c) a button (d) a single number
5. 5.💾 What number does this code show?
   let songs = ["Sunrise", "Kites", "Ocean"];
   songs.push("Monsoon");
   show(songs.length);
6. 6.💾 pop() takes off the last item. What does this code show?
   let notes = ["Hindi", "Art", "Science", "Sports"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Science (b) Art (c) Hindi (d) Sports
7. 7.Which of these fits saving on the phone? (a) a draft you are typing (b) photos on two devices (c) a class leaderboard (d) a shared to-do list
8. 8.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) chat messages to friends (d) notes to read offline
9. 9.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) use it on any device (c) never need a password (d) skip the internet
10. 10.💾 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
11. 11.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
12. 12.💾 What number does this code show?
    let notes = ["Music", "Maths"];
    notes.push("Hindi");
    notes.push("Science");
    show(notes.length);
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Sports", "Science", "Music", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Maths (c) Music (d) Sports
14. 14.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
15. 15.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
16. 16.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) the sound on/off setting (d) a class leaderboard
17. 17.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
18. 18.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) your last game level (d) a shared to-do list
19. 19.True or false: photos on two devices fits saving on the phone. (a) False (b) True
20. 20.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
21. 21.True or false: notes to read offline fits saving on the phone. (a) False (b) True
22. 22.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
23. 23.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Science", "Sports"];
    show(notes[1]); (a) Art (b) Science (c) Sports (d) Maths
24. 24.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 2;
    show(score);
25. 25.💾 What number does this code show?
    let songs = ["Monsoon", "Sunrise", "Rain", "Kites"];
    songs.push("Ocean");
    songs.push("Stars");
    show(songs.length);
26. 26.💾 What number does this code show?
    let notes = ["Science", "Music", "Maths"];
    notes.push("Hindi");
    show(notes.length);
27. 27.💾 What is a variable? (a) a named box for a value (b) a phone setting (c) a type of screen (d) a picture
28. 28.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 3;
    show(score);
29. 29.Which of these fits saving on the phone? (a) chat messages to friends (b) a shared to-do list (c) notes to read offline (d) a class leaderboard
30. 30.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Maths", "Science", "Music"];
    show(notes[1]); (a) Music (b) Hindi (c) Science (d) Maths
31. 31.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
32. 32.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) a class leaderboard (d) your last game level
33. 33.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Sports", "Art", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Art (d) Science
34. 34.💾 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
35. 35.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
36. 36.💾 What number does this code show?
    let points = 3;
    points = points - 1;
    points = points + 3;
    show(points);
37. 37.💾 Which works with no internet at all? (a) a shared chat (b) a cloud leaderboard (c) a cloud backup (d) data saved on the phone
38. 38.💾 What number does this code show?
    let coins = 6;
    coins = coins - 6;
    coins = coins + 3;
    show(coins);
39. 39.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Hindi", "Sports", "Art"];
    show(notes[1]); (a) Hindi (b) Maths (c) Music (d) Sports
40. 40.💾 What number does this code show?
    let notes = ["Science", "Art", "Music", "Maths"];
    notes.push("Sports");
    show(notes.length);

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students