App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 792 · 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.Which of these fits saving in the cloud? (a) notes to read offline (b) your last game level (c) a class leaderboard (d) the sound on/off setting
2. 2.Which of these fits saving in the cloud? (a) a draft you are typing (b) photos on two devices (c) the sound on/off setting (d) notes to read offline
3. 3.💾 pop() takes off the last item. What does this code show?
   let friends = ["Riya", "Zoya", "Meera"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Meera (b) Riya (c) Zoya
4. 4.Which of these fits saving on the phone? (a) a shared to-do list (b) photos on two devices (c) a draft you are typing (d) a class leaderboard
5. 5.💾 Which works with no internet at all? (a) data saved on the phone (b) a shared chat (c) a cloud leaderboard (d) a cloud backup
6. 6.💾 What does this code show? (Positions start at 0.)
   let songs = ["Rain", "Monsoon", "Sunrise", "Ocean", "Kites"];
   show(songs[1]); (a) Sunrise (b) Ocean (c) Rain (d) Monsoon
7. 7.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 0 (c) 10 (d) 2
8. 8.💾 pop() takes off the last item. What does this code show?
   let notes = ["Hindi", "Music", "Art", "Sports", "Maths"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Music (c) Sports (d) Hindi
9. 9.💾 What number does this code show?
   let friends = ["Riya", "Kabir"];
   friends.push("Zoya");
   friends.push("Arjun");
   show(friends.length);
10. 10.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Art", "Music", "Maths", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Art (c) Music (d) Maths
11. 11.💾 Which can hold many values in order? (a) a button (b) a list (c) a switch (d) a single number
12. 12.💾 What is a variable? (a) a picture (b) a named box for a value (c) a type of screen (d) a phone setting
13. 13.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Kites", "Stars", "Ocean", "Rain"];
    show(songs[2]); (a) Monsoon (b) Kites (c) Stars (d) Ocean
14. 14.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
15. 15.💾 What number does this code show?
    let songs = ["Rain", "Kites", "Sunrise", "Monsoon"];
    songs.push("Ocean");
    songs.push("Stars");
    show(songs.length);
16. 16.Which of these fits saving on the phone? (a) chat messages to friends (b) a shared to-do list (c) photos on two devices (d) the sound on/off setting
17. 17.True or false: notes to read offline fits saving on the phone. (a) True (b) False
18. 18.💾 What number does this code show?
    let friends = ["Kabir", "Zoya"];
    friends.push("Arjun");
    friends.push("Aman");
    show(friends.length);
19. 19.💾 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
20. 20.True or false: your last game level fits saving on the phone. (a) True (b) False
21. 21.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) chat messages to friends (d) notes to read offline
22. 22.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
23. 23.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Sports", "Art", "Maths", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Art (c) Maths (d) Music
24. 24.Which of these fits saving in the cloud? (a) a draft you are typing (b) your last game level (c) a shared to-do list (d) notes to read offline
25. 25.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 What number does this code show?
    let songs = ["Ocean", "Sunrise"];
    songs.push("Stars");
    show(songs.length);
27. 27.Which of these fits saving on the phone? (a) your last game level (b) a class leaderboard (c) photos on two devices (d) chat messages to friends
28. 28.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) the phone is lost (c) you send a message (d) the screen turns off
29. 29.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Monsoon", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Kites (c) Monsoon
30. 30.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Arjun", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Arjun (c) Kabir
31. 31.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Arjun", "Riya", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Zoya (c) Meera (d) Riya
32. 32.💾 What number does this code show?
    let notes = ["Maths", "Science", "Sports"];
    notes.push("Hindi");
    show(notes.length);
33. 33.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Monsoon", "Ocean"];
    show(songs[2]); (a) Ocean (b) Monsoon (c) Sunrise
34. 34.💾 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
35. 35.💾 What number does this code show?
    let songs = ["Stars", "Kites"];
    songs.push("Sunrise");
    show(songs.length);
36. 36.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Maths", "Sports"];
    notes.push("Science");
    show(notes.length);
37. 37.💾 What number does this code show?
    let points = 4;
    points = points - 2;
    points = points + 2;
    show(points);
38. 38.💾 What number does this code show?
    let score = 6;
    score = score - 6;
    score = score + 3;
    show(score);
39. 39.💾 What number does this code show?
    let songs = ["Monsoon", "Kites", "Sunrise"];
    songs.push("Rain");
    songs.push("Ocean");
    show(songs.length);
40. 40.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Hindi", "Maths", "Music"];
    show(notes[4]); (a) Music (b) Sports (c) Science (d) Hindi

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