App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 711 · 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.💾 pop() takes off the last item. What does this code show?
   let notes = ["Sports", "Maths", "Art"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Maths (c) Sports
2. 2.💾 Which can hold many values in order? (a) a switch (b) a list (c) a single number (d) a button
3. 3.💾 What number does this code show?
   let notes = ["Maths", "Science", "Art"];
   notes.push("Sports");
   notes.push("Music");
   show(notes.length);
4. 4.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) never need a password (c) use it on any device (d) skip the internet
5. 5.💾 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
6. 6.💾 What does this code show? (Positions start at 0.)
   let songs = ["Sunrise", "Rain", "Kites", "Monsoon", "Stars"];
   show(songs[4]); (a) Sunrise (b) Rain (c) Stars (d) Kites
7. 7.💾 What is a variable? (a) a phone setting (b) a picture (c) a type of screen (d) a named box for a value
8. 8.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 1 (c) 0 (d) 10
9. 9.💾 What does this code show? (Positions start at 0.)
   let songs = ["Rain", "Stars", "Kites"];
   show(songs[0]); (a) Stars (b) Rain (c) Kites
10. 10.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) photos on two devices (d) a draft you are typing
11. 11.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Sunrise", "Kites", "Ocean", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Sunrise (c) Kites (d) Ocean
12. 12.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) a class leaderboard (d) your last game level
13. 13.💾 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
14. 14.💾 What number does this code show?
    let songs = ["Stars", "Kites", "Rain", "Ocean"];
    songs.push("Monsoon");
    songs.push("Sunrise");
    show(songs.length);
15. 15.💾 What number does this code show?
    let notes = ["Sports", "Art"];
    notes.push("Maths");
    show(notes.length);
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: the sound on/off setting fits saving in the cloud. (a) False (b) True
18. 18.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Monsoon", "Kites"];
    show(songs[2]); (a) Stars (b) Monsoon (c) Kites
19. 19.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Aman", "Meera"];
    show(friends[2]); (a) Meera (b) Kabir (c) Aman
20. 20.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Monsoon", "Sunrise", "Kites", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Kites (c) Monsoon (d) Sunrise
21. 21.💾 What number does this code show?
    let friends = ["Aman", "Riya", "Zoya", "Kabir"];
    friends.push("Meera");
    friends.push("Arjun");
    show(friends.length);
22. 22.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
23. 23.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
24. 24.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Monsoon", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Rain
25. 25.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Kites", "Rain", "Sunrise", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Sunrise (c) Ocean (d) Rain
26. 26.💾 What number does this code show?
    let notes = ["Art", "Science", "Music", "Maths"];
    notes.push("Sports");
    notes.push("Hindi");
    show(notes.length);
27. 27.Which of these fits saving on the phone? (a) a class leaderboard (b) notes to read offline (c) chat messages to friends (d) photos on two devices
28. 28.Which of these fits saving in the cloud? (a) your last game level (b) a class leaderboard (c) the sound on/off setting (d) notes to read offline
29. 29.💾 What number does this code show?
    let songs = ["Rain", "Stars"];
    songs.push("Sunrise");
    songs.push("Kites");
    show(songs.length);
30. 30.💾 What number does this code show?
    let songs = ["Ocean", "Rain", "Kites", "Stars"];
    songs.push("Sunrise");
    show(songs.length);
31. 31.True or false: your last game level fits saving on the phone. (a) False (b) True
32. 32.Which of these fits saving in the cloud? (a) a draft you are typing (b) the sound on/off setting (c) chat messages to friends (d) your last game level
33. 33.💾 What number does this code show?
    let friends = ["Aman", "Arjun"];
    friends.push("Zoya");
    show(friends.length);
34. 34.True or false: notes to read offline fits saving in the cloud. (a) False (b) True
35. 35.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Sports", "Science", "Hindi"];
    show(notes[4]); (a) Hindi (b) Sports (c) Art (d) Maths
36. 36.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
37. 37.Which of these fits saving on the phone? (a) the sound on/off setting (b) photos on two devices (c) a shared to-do list (d) chat messages to friends
38. 38.💾 What number does this code show?
    let songs = ["Kites", "Monsoon", "Rain", "Stars"];
    songs.push("Ocean");
    songs.push("Sunrise");
    show(songs.length);
39. 39.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
40. 40.💾 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

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