App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 896 · 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.True or false: notes to read offline fits saving on the phone. (a) False (b) True
2. 2.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
3. 3.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 10 (d) 0
4. 4.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
5. 5.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a draft you are typing (c) notes to read offline (d) chat messages to friends
6. 6.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) chat messages to friends (d) a draft you are typing
7. 7.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
8. 8.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
9. 9.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
10. 10.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Art", "Sports", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Maths (d) Art
11. 11.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Hindi", "Science", "Sports"];
    show(notes[1]); (a) Music (b) Sports (c) Hindi (d) Science
12. 12.Which of these fits saving in the cloud? (a) a shared to-do list (b) your last game level (c) the sound on/off setting (d) a draft you are typing
13. 13.💾 What number does this code show?
    let score = 7;
    score = score - 2;
    score = score + 1;
    show(score);
14. 14.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
15. 15.💾 Which can hold many values in order? (a) a list (b) a button (c) a switch (d) a single number
16. 16.💾 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
17. 17.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Hindi", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Science (c) Maths
18. 18.💾 What number does this code show?
    let coins = 8;
    coins = coins - 5;
    coins = coins + 4;
    show(coins);
19. 19.💾 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
20. 20.💾 What is a variable? (a) a phone setting (b) a named box for a value (c) a type of screen (d) a picture
21. 21.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Zoya", "Kabir", "Riya", "Aman"];
    show(friends[4]); (a) Kabir (b) Zoya (c) Meera (d) Aman
22. 22.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Ocean", "Kites"];
    show(songs[0]); (a) Rain (b) Ocean (c) Kites
23. 23.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
24. 24.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) photos on two devices (d) your last game level
25. 25.💾 What number does this code show?
    let coins = 7;
    coins = coins - 5;
    coins = coins + 2;
    show(coins);
26. 26.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
28. 28.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) photos on two devices (d) the sound on/off setting
29. 29.💾 What number does this code show?
    let friends = ["Aman", "Arjun", "Riya", "Meera"];
    friends.push("Kabir");
    show(friends.length);
30. 30.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Zoya", "Arjun"];
    show(friends[1]); (a) Aman (b) Zoya (c) Arjun
31. 31.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) skip the internet (c) never need a password (d) shrink the app
32. 32.💾 What number does this code show?
    let songs = ["Stars", "Monsoon", "Ocean", "Kites"];
    songs.push("Sunrise");
    show(songs.length);
33. 33.True or false: your last game level fits saving on the phone. (a) True (b) False
34. 34.💾 What number does this code show?
    let lives = 6;
    lives = lives - 4;
    lives = lives + 4;
    show(lives);
35. 35.💾 pop() takes off the last item. What does this code show?
    let songs = ["Stars", "Kites", "Rain", "Sunrise", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Kites (c) Rain (d) Sunrise
36. 36.💾 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
37. 37.True or false: photos on two devices fits saving on the phone. (a) False (b) True
38. 38.💾 What number does this code show?
    let lives = 4;
    lives = lives - 2;
    lives = lives + 3;
    show(lives);
39. 39.Which of these fits saving in the cloud? (a) a draft you are typing (b) the sound on/off setting (c) a class leaderboard (d) notes to read offline
40. 40.Which of these fits saving on the phone? (a) notes to read offline (b) chat messages to friends (c) a class leaderboard (d) photos on two devices

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