App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 976 · 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 = ["Maths", "Sports", "Art", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Maths (b) Hindi (c) Sports (d) Art
2. 2.💾 pop() takes off the last item. What does this code show?
   let friends = ["Arjun", "Meera", "Kabir"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Meera (b) Arjun (c) Kabir
3. 3.💾 What does this code show? (Positions start at 0.)
   let friends = ["Arjun", "Kabir", "Aman"];
   show(friends[0]); (a) Aman (b) Arjun (c) Kabir
4. 4.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) a shared to-do list (d) notes to read offline
5. 5.💾 What does this code show? (Positions start at 0.)
   let songs = ["Sunrise", "Monsoon", "Rain"];
   show(songs[0]); (a) Sunrise (b) Rain (c) Monsoon
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.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) your last game level (d) chat messages to friends
8. 8.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
9. 9.💾 What number does this code show?
   let songs = ["Monsoon", "Rain", "Kites"];
   songs.push("Ocean");
   show(songs.length);
10. 10.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
11. 11.💾 What number does this code show?
    let score = 6;
    score = score - 1;
    score = score + 2;
    show(score);
12. 12.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
13. 13.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
14. 14.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
15. 15.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
16. 16.💾 What is a variable? (a) a type of screen (b) a named box for a value (c) a phone setting (d) a picture
17. 17.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) photos on two devices (d) a draft you are typing
18. 18.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 10 (d) 1
19. 19.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a list (d) a button
20. 20.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
21. 21.💾 What number does this code show?
    let friends = ["Zoya", "Aman", "Kabir"];
    friends.push("Meera");
    show(friends.length);
22. 22.💾 What number does this code show?
    let songs = ["Sunrise", "Rain", "Monsoon", "Ocean"];
    songs.push("Kites");
    songs.push("Stars");
    show(songs.length);
23. 23.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
24. 24.💾 What number does this code show?
    let coins = 9;
    coins = coins - 3;
    coins = coins + 2;
    show(coins);
25. 25.💾 What number does this code show?
    let friends = ["Meera", "Aman", "Kabir", "Arjun"];
    friends.push("Zoya");
    show(friends.length);
26. 26.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Art", "Science", "Music"];
    show(notes[1]); (a) Science (b) Art (c) Music (d) Maths
27. 27.💾 Which works with no internet at all? (a) a cloud backup (b) data saved on the phone (c) a shared chat (d) a cloud leaderboard
28. 28.💾 What number does this code show?
    let stars = 8;
    stars = stars - 6;
    stars = stars + 1;
    show(stars);
29. 29.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Music", "Maths", "Sports", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Maths (c) Music (d) Art
30. 30.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Kabir", "Arjun", "Riya", "Meera"];
    show(friends[1]); (a) Arjun (b) Riya (c) Kabir (d) Zoya
31. 31.💾 What number does this code show?
    let friends = ["Arjun", "Meera", "Zoya", "Aman"];
    friends.push("Kabir");
    friends.push("Riya");
    show(friends.length);
32. 32.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
33. 33.💾 What number does this code show?
    let friends = ["Kabir", "Meera"];
    friends.push("Aman");
    friends.push("Zoya");
    show(friends.length);
34. 34.💾 What number does this code show?
    let notes = ["Science", "Maths", "Sports", "Music"];
    notes.push("Art");
    notes.push("Hindi");
    show(notes.length);
35. 35.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Monsoon", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Monsoon (c) Stars
36. 36.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
37. 37.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Riya", "Kabir", "Zoya"];
    show(friends[0]); (a) Riya (b) Aman (c) Kabir (d) Meera
38. 38.💾 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
39. 39.True or false: your last game level fits saving on the phone. (a) False (b) True
40. 40.💾 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

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