App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 954 · 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 friends = ["Arjun", "Aman", "Zoya"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Arjun (b) Zoya (c) Aman
2. 2.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
3. 3.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
4. 4.💾 What number does this code show?
   let points = 9;
   points = points - 3;
   points = points + 4;
   show(points);
5. 5.💾 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
6. 6.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) a draft you are typing (d) a shared to-do list
7. 7.💾 What number does this code show?
   let coins = 9;
   coins = coins - 3;
   coins = coins + 5;
   show(coins);
8. 8.💾 What does this code show? (Positions start at 0.)
   let friends = ["Meera", "Riya", "Arjun", "Aman", "Zoya"];
   show(friends[0]); (a) Riya (b) Arjun (c) Aman (d) Meera
9. 9.💾 What number does this code show?
   let points = 6;
   points = points - 2;
   points = points + 1;
   show(points);
10. 10.💾 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
11. 11.True or false: notes to read offline fits saving on the phone. (a) True (b) False
12. 12.💾 What number does this code show?
    let score = 5;
    score = score - 3;
    score = score + 4;
    show(score);
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Music", "Art", "Maths", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Hindi (c) Art (d) Maths
14. 14.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
15. 15.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Monsoon", "Stars", "Sunrise", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Rain (c) Stars (d) Sunrise
16. 16.💾 What number does this code show?
    let coins = 8;
    coins = coins - 7;
    coins = coins + 1;
    show(coins);
17. 17.Which of these fits saving in the cloud? (a) a draft you are typing (b) notes to read offline (c) photos on two devices (d) your last game level
18. 18.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Sunrise", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Rain (c) Ocean
19. 19.💾 Which can hold many values in order? (a) a switch (b) a list (c) a single number (d) a button
20. 20.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a shared to-do list (c) notes to read offline (d) a draft you are typing
21. 21.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Zoya", "Arjun", "Meera", "Aman"];
    show(friends[0]); (a) Riya (b) Meera (c) Arjun (d) Zoya
22. 22.Which of these fits saving on the phone? (a) chat messages to friends (b) notes to read offline (c) photos on two devices (d) a class leaderboard
23. 23.💾 What number does this code show?
    let notes = ["Science", "Art"];
    notes.push("Sports");
    notes.push("Hindi");
    show(notes.length);
24. 24.💾 What is a variable? (a) a named box for a value (b) a type of screen (c) a picture (d) a phone setting
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 score = 4;
    score = score - 4;
    score = score + 1;
    show(score);
27. 27.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
28. 28.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
29. 29.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
30. 30.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a shared chat (d) a cloud backup
31. 31.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 10 (c) 2 (d) 0
32. 32.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
33. 33.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Science", "Art", "Maths", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Maths (d) Hindi
34. 34.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
35. 35.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) a class leaderboard (d) a draft you are typing
36. 36.💾 What number does this code show?
    let songs = ["Stars", "Rain", "Sunrise", "Monsoon"];
    songs.push("Kites");
    songs.push("Ocean");
    show(songs.length);
37. 37.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) your last game level (d) chat messages to friends
38. 38.True or false: your last game level fits saving in the cloud. (a) True (b) False
39. 39.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Arjun", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Meera (c) Arjun
40. 40.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Kites", "Monsoon", "Rain"];
    show(songs[2]); (a) Rain (b) Monsoon (c) Kites (d) Ocean

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