App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 178 · 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.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a cloud backup (d) a shared chat
2. 2.Which of these fits saving in the cloud? (a) chat messages to friends (b) a draft you are typing (c) the sound on/off setting (d) your last game level
3. 3.💾 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
4. 4.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) use it on any device (c) never need a password (d) shrink the app
5. 5.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
6. 6.💾 What number does this code show?
   let songs = ["Monsoon", "Rain"];
   songs.push("Stars");
   show(songs.length);
7. 7.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
8. 8.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
9. 9.💾 What is a variable? (a) a type of screen (b) a named box for a value (c) a phone setting (d) a picture
10. 10.True or false: photos on two devices fits saving on the phone. (a) False (b) True
11. 11.💾 What number does this code show?
    let songs = ["Monsoon", "Rain"];
    songs.push("Sunrise");
    show(songs.length);
12. 12.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
13. 13.Which of these fits saving on the phone? (a) the sound on/off setting (b) chat messages to friends (c) photos on two devices (d) a class leaderboard
14. 14.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) a draft you are typing (d) chat messages to friends
15. 15.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
16. 16.Which of these fits saving in the cloud? (a) photos on two devices (b) a draft you are typing (c) notes to read offline (d) your last game level
17. 17.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Hindi", "Science", "Sports"];
    show(notes[3]); (a) Hindi (b) Maths (c) Science (d) Art
18. 18.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Art", "Science"];
    show(notes[1]); (a) Art (b) Science (c) Hindi
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Music", "Sports", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Hindi (c) Sports (d) Science
20. 20.True or false: notes to read offline fits saving on the phone. (a) False (b) True
21. 21.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
22. 22.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
23. 23.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
24. 24.💾 What number does this code show?
    let notes = ["Music", "Hindi"];
    notes.push("Sports");
    show(notes.length);
25. 25.💾 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
26. 26.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a button (d) a list
27. 27.💾 What number does this code show?
    let notes = ["Maths", "Science"];
    notes.push("Hindi");
    show(notes.length);
28. 28.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Sports", "Science", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Art (d) Science
29. 29.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Ocean", "Rain", "Sunrise", "Stars"];
    show(songs[1]); (a) Rain (b) Ocean (c) Monsoon (d) Sunrise
30. 30.💾 What number does this code show?
    let coins = 9;
    coins = coins - 8;
    coins = coins + 1;
    show(coins);
31. 31.💾 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
32. 32.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) your last game level (d) chat messages to friends
33. 33.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Science", "Sports", "Art", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Science (d) Art
34. 34.💾 What number does this code show?
    let notes = ["Sports", "Art", "Science", "Music"];
    notes.push("Hindi");
    show(notes.length);
35. 35.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) notes to read offline (d) a class leaderboard
36. 36.Which of these fits saving on the phone? (a) chat messages to friends (b) a shared to-do list (c) photos on two devices (d) notes to read offline
37. 37.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
38. 38.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Kites", "Ocean"];
    show(songs[0]); (a) Ocean (b) Kites (c) Rain
39. 39.💾 What number does this code show?
    let friends = ["Riya", "Aman", "Kabir", "Arjun"];
    friends.push("Meera");
    friends.push("Zoya");
    show(friends.length);
40. 40.💾 What number does this code show?
    let stars = 3;
    stars = stars - 1;
    stars = stars + 3;
    show(stars);

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