App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 788 · 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.💾 What number does this code show?
   let score = 8;
   score = score - 8;
   score = score + 4;
   show(score);
2. 2.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a draft you are typing (c) a class leaderboard (d) your last game level
3. 3.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
4. 4.💾 What does this code show? (Positions start at 0.)
   let notes = ["Sports", "Hindi", "Science", "Maths", "Art"];
   show(notes[0]); (a) Maths (b) Science (c) Hindi (d) Sports
5. 5.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) never need a password (d) use it on any device
6. 6.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
7. 7.True or false: notes to read offline fits saving on the phone. (a) True (b) False
8. 8.💾 pop() takes off the last item. What does this code show?
   let notes = ["Art", "Hindi", "Maths", "Music", "Science"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Music (b) Hindi (c) Art (d) Maths
9. 9.💾 Which can hold many values in order? (a) a single number (b) a list (c) a button (d) a switch
10. 10.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Hindi", "Science"];
    show(notes[0]); (a) Maths (b) Art (c) Hindi (d) Science
11. 11.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
12. 12.Which of these fits saving on the phone? (a) a draft you are typing (b) a class leaderboard (c) a shared to-do list (d) photos on two devices
13. 13.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
14. 14.💾 What is a variable? (a) a picture (b) a phone setting (c) a named box for a value (d) a type of screen
15. 15.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) the app is closed (c) the screen turns off (d) you send a message
16. 16.Which of these fits saving in the cloud? (a) chat messages to friends (b) your last game level (c) the sound on/off setting (d) notes to read offline
17. 17.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
18. 18.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Sports", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Science (c) Maths
19. 19.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
20. 20.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Arjun", "Meera"];
    show(friends[0]); (a) Arjun (b) Meera (c) Riya
21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Music", "Science", "Art"];
    show(notes[3]); (a) Maths (b) Hindi (c) Music (d) Science
22. 22.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Zoya", "Aman"];
    show(friends[0]); (a) Zoya (b) Aman (c) Arjun
23. 23.💾 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
24. 24.Which of these fits saving on the phone? (a) chat messages to friends (b) notes to read offline (c) a class leaderboard (d) photos on two devices
25. 25.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Science", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Science
26. 26.💾 What number does this code show?
    let notes = ["Art", "Sports", "Maths"];
    notes.push("Music");
    show(notes.length);
27. 27.💾 What number does this code show?
    let notes = ["Maths", "Hindi", "Art", "Science"];
    notes.push("Music");
    show(notes.length);
28. 28.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Aman", "Riya", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Kabir (b) Aman (c) Meera (d) Riya
29. 29.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Zoya", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Zoya (b) Arjun (c) Aman
30. 30.💾 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
31. 31.💾 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
32. 32.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Riya", "Aman"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Aman (c) Meera
33. 33.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
34. 34.💾 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
35. 35.💾 What number does this code show?
    let notes = ["Sports", "Music", "Maths", "Hindi"];
    notes.push("Art");
    show(notes.length);
36. 36.💾 What number does this code show?
    let songs = ["Stars", "Kites", "Rain", "Monsoon"];
    songs.push("Sunrise");
    show(songs.length);
37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Maths", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Maths
38. 38.💾 What number does this code show?
    let notes = ["Maths", "Hindi"];
    notes.push("Art");
    show(notes.length);
39. 39.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
40. 40.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Music", "Maths", "Sports", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Sports (c) Maths (d) Music

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