App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 288 · 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 photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) notes to read offline (d) photos on two devices
3. 3.True or false: your last game level fits saving on the phone. (a) True (b) False
4. 4.💾 What number does this code show?
   let notes = ["Art", "Maths", "Science"];
   notes.push("Hindi");
   notes.push("Music");
   show(notes.length);
5. 5.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
6. 6.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) chat messages to friends (d) a draft you are typing
7. 7.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) a class leaderboard (d) a draft you are typing
8. 8.💾 What does this code show? (Positions start at 0.)
   let friends = ["Arjun", "Meera", "Riya", "Aman", "Zoya"];
   show(friends[4]); (a) Meera (b) Zoya (c) Riya (d) Arjun
9. 9.💾 Which can hold many values in order? (a) a button (b) a single number (c) a list (d) a switch
10. 10.💾 What is a variable? (a) a type of screen (b) a picture (c) a named box for a value (d) a phone setting
11. 11.💾 What number does this code show?
    let friends = ["Riya", "Arjun", "Aman", "Zoya"];
    friends.push("Kabir");
    show(friends.length);
12. 12.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
13. 13.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Riya", "Meera", "Kabir"];
    show(friends[1]); (a) Riya (b) Zoya (c) Meera (d) Kabir
14. 14.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Arjun", "Kabir"];
    show(friends[2]); (a) Arjun (b) Kabir (c) Riya
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Sports", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Music (c) Hindi
16. 16.💾 What does this code show? (Positions start at 0.)
    let friends = ["Kabir", "Riya", "Aman"];
    show(friends[0]); (a) Riya (b) Aman (c) Kabir
17. 17.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
18. 18.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Aman", "Kabir", "Arjun"];
    show(friends[3]); (a) Riya (b) Arjun (c) Kabir (d) Aman
19. 19.💾 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
20. 20.True or false: your last game level fits saving in the cloud. (a) False (b) True
21. 21.True or false: photos on two devices fits saving on the phone. (a) False (b) True
22. 22.💾 What number does this code show?
    let notes = ["Maths", "Science", "Hindi"];
    notes.push("Art");
    notes.push("Music");
    show(notes.length);
23. 23.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) use it on any device (c) never need a password (d) shrink the app
24. 24.💾 What number does this code show?
    let coins = 8;
    coins = coins - 2;
    coins = coins + 1;
    show(coins);
25. 25.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Kites", "Ocean", "Rain"];
    show(songs[0]); (a) Ocean (b) Rain (c) Kites (d) Sunrise
27. 27.💾 What number does this code show?
    let notes = ["Hindi", "Science", "Sports", "Music"];
    notes.push("Maths");
    notes.push("Art");
    show(notes.length);
28. 28.💾 What number does this code show?
    let friends = ["Kabir", "Aman", "Zoya"];
    friends.push("Arjun");
    show(friends.length);
29. 29.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Maths", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Music (c) Maths
30. 30.💾 What number does this code show?
    let notes = ["Maths", "Science"];
    notes.push("Sports");
    show(notes.length);
31. 31.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
32. 32.💾 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
33. 33.💾 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
34. 34.True or false: notes to read offline fits saving on the phone. (a) False (b) True
35. 35.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
36. 36.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Sports"];
    show(notes[0]); (a) Hindi (b) Maths (c) Sports
37. 37.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Art", "Sports", "Maths"];
    show(notes[0]); (a) Art (b) Sports (c) Music (d) Maths
39. 39.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Aman", "Riya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Kabir (c) Meera (d) Riya
40. 40.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Kabir", "Arjun", "Meera", "Aman"];
    show(friends[0]); (a) Meera (b) Zoya (c) Arjun (d) Kabir

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