App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 138 · 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 notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.💾 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
3. 3.💾 What does this code show? (Positions start at 0.)
   let songs = ["Ocean", "Stars", "Rain"];
   show(songs[2]); (a) Ocean (b) Rain (c) Stars
4. 4.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
5. 5.💾 What number does this code show?
   let friends = ["Zoya", "Arjun", "Riya"];
   friends.push("Aman");
   show(friends.length);
6. 6.💾 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
7. 7.💾 Saving data in the cloud lets you ___. (a) never need a password (b) shrink the app (c) use it on any device (d) skip the internet
8. 8.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) the sound on/off setting (d) a class leaderboard
9. 9.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) a draft you are typing (d) a class leaderboard
10. 10.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
11. 11.True or false: notes to read offline fits saving on the phone. (a) False (b) True
12. 12.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Music", "Hindi"];
    show(notes[0]); (a) Science (b) Hindi (c) Music
13. 13.💾 What number does this code show?
    let stars = 4;
    stars = stars - 2;
    stars = stars + 2;
    show(stars);
14. 14.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
15. 15.💾 What is a variable? (a) a phone setting (b) a picture (c) a named box for a value (d) a type of screen
16. 16.💾 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
17. 17.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the phone is lost (c) the screen turns off (d) the app is closed
18. 18.Which of these fits saving in the cloud? (a) notes to read offline (b) photos on two devices (c) the sound on/off setting (d) a draft you are typing
19. 19.True or false: your last game level fits saving in the cloud. (a) True (b) False
20. 20.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) notes to read offline (d) a class leaderboard
21. 21.💾 What number does this code show?
    let notes = ["Music", "Maths"];
    notes.push("Hindi");
    notes.push("Art");
    show(notes.length);
22. 22.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) a class leaderboard (d) your last game level
23. 23.True or false: chat messages to friends fits saving on the phone. (a) False (b) True
24. 24.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
25. 25.💾 What number does this code show?
    let friends = ["Aman", "Kabir"];
    friends.push("Meera");
    show(friends.length);
26. 26.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Meera", "Arjun", "Kabir", "Zoya"];
    show(friends[0]); (a) Riya (b) Arjun (c) Kabir (d) Meera
27. 27.💾 Which can hold many values in order? (a) a button (b) a list (c) a single number (d) a switch
28. 28.💾 What number does this code show?
    let friends = ["Aman", "Riya"];
    friends.push("Arjun");
    show(friends.length);
29. 29.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 0 (c) 10 (d) 2
30. 30.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
31. 31.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) the sound on/off setting (d) a class leaderboard
32. 32.💾 What number does this code show?
    let points = 6;
    points = points - 1;
    points = points + 1;
    show(points);
33. 33.💾 What number does this code show?
    let coins = 8;
    coins = coins - 2;
    coins = coins + 2;
    show(coins);
34. 34.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) chat messages to friends
35. 35.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Art", "Hindi", "Sports"];
    show(notes[1]); (a) Science (b) Art (c) Hindi (d) Sports
36. 36.💾 What number does this code show?
    let notes = ["Art", "Music", "Sports", "Science"];
    notes.push("Hindi");
    show(notes.length);
37. 37.💾 What number does this code show?
    let stars = 4;
    stars = stars - 3;
    stars = stars + 3;
    show(stars);
38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Science", "Music"];
    show(notes[2]); (a) Music (b) Maths (c) Science
39. 39.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) the sound on/off setting (d) a shared to-do list
40. 40.💾 What number does this code show?
    let notes = ["Science", "Music", "Hindi"];
    notes.push("Maths");
    show(notes.length);

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