App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 432 · 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 of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) notes to read offline (d) chat messages to friends
2. 2.Which of these fits saving on the phone? (a) your last game level (b) a shared to-do list (c) a class leaderboard (d) photos on two devices
3. 3.💾 What number does this code show?
   let lives = 6;
   lives = lives - 1;
   lives = lives + 4;
   show(lives);
4. 4.💾 pop() takes off the last item. What does this code show?
   let notes = ["Science", "Hindi", "Sports"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Science (b) Sports (c) Hindi
5. 5.💾 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
6. 6.💾 What does this code show? (Positions start at 0.)
   let notes = ["Art", "Maths", "Science", "Music", "Sports"];
   show(notes[0]); (a) Music (b) Maths (c) Art (d) Science
7. 7.💾 pop() takes off the last item. What does this code show?
   let notes = ["Art", "Maths", "Hindi", "Sports", "Science"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Maths (b) Art (c) Sports (d) Hindi
8. 8.💾 pop() takes off the last item. What does this code show?
   let notes = ["Sports", "Science", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Science (b) Sports (c) Hindi
9. 9.💾 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
10. 10.💾 Which works with no internet at all? (a) data saved on the phone (b) a shared chat (c) a cloud backup (d) a cloud leaderboard
11. 11.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
12. 12.💾 What number does this code show?
    let lives = 5;
    lives = lives - 1;
    lives = lives + 5;
    show(lives);
13. 13.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
14. 14.Which of these fits saving on the phone? (a) photos on two devices (b) a draft you are typing (c) a shared to-do list (d) a class leaderboard
15. 15.💾 What number does this code show?
    let notes = ["Maths", "Music", "Art"];
    notes.push("Sports");
    notes.push("Hindi");
    show(notes.length);
16. 16.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) use it on any device (c) shrink the app (d) never need a password
17. 17.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) the phone is lost (c) you send a message (d) the screen turns off
18. 18.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Arjun", "Riya"];
    show(friends[2]); (a) Arjun (b) Zoya (c) Riya
19. 19.💾 What number does this code show?
    let score = 9;
    score = score - 9;
    score = score + 1;
    show(score);
20. 20.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) a draft you are typing (d) chat messages to friends
21. 21.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Maths", "Science", "Sports", "Hindi"];
    show(notes[2]); (a) Music (b) Science (c) Maths (d) Sports
22. 22.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
23. 23.True or false: your last game level fits saving on the phone. (a) True (b) False
24. 24.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
25. 25.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
26. 26.💾 What number does this code show?
    let songs = ["Rain", "Kites", "Sunrise", "Ocean"];
    songs.push("Monsoon");
    show(songs.length);
27. 27.True or false: photos on two devices fits saving on the phone. (a) False (b) True
28. 28.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) a shared to-do list (d) a draft you are typing
29. 29.💾 What number does this code show?
    let songs = ["Sunrise", "Rain"];
    songs.push("Stars");
    show(songs.length);
30. 30.💾 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
31. 31.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
32. 32.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
33. 33.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 1 (c) 10 (d) 0
34. 34.Which of these fits saving in the cloud? (a) a draft you are typing (b) notes to read offline (c) the sound on/off setting (d) photos on two devices
35. 35.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
36. 36.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Art", "Hindi"];
    show(notes[2]); (a) Hindi (b) Science (c) Art
37. 37.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Monsoon", "Sunrise", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Sunrise (c) Monsoon (d) Rain
38. 38.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
39. 39.💾 What number does this code show?
    let notes = ["Art", "Sports"];
    notes.push("Hindi");
    show(notes.length);
40. 40.💾 What is a variable? (a) a named box for a value (b) a type of screen (c) a picture (d) a phone setting

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