App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 466 · 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.💾 pop() takes off the last item. What does this code show?
   let notes = ["Science", "Art", "Hindi", "Sports", "Maths"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Sports (c) Hindi (d) Science
3. 3.💾 Which can hold many values in order? (a) a switch (b) a button (c) a list (d) a single number
4. 4.💾 pop() takes off the last item. What does this code show?
   let notes = ["Hindi", "Sports", "Art", "Maths"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Art (b) Sports (c) Hindi (d) Maths
5. 5.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) data saved on the phone (d) a shared chat
6. 6.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Hindi", "Science"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Music (b) Science (c) Hindi
7. 7.💾 What number does this code show?
   let points = 9;
   points = points - 4;
   points = points + 1;
   show(points);
8. 8.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
9. 9.💾 What does this code show? (Positions start at 0.)
   let notes = ["Maths", "Hindi", "Science", "Sports", "Music"];
   show(notes[1]); (a) Hindi (b) Sports (c) Science (d) Maths
10. 10.Which of these fits saving on the phone? (a) photos on two devices (b) notes to read offline (c) chat messages to friends (d) a class leaderboard
11. 11.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) your last game level (d) chat messages to friends
12. 12.Which of these fits saving in the cloud? (a) the sound on/off setting (b) notes to read offline (c) your last game level (d) a class leaderboard
13. 13.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Aman", "Meera", "Kabir"];
    show(friends[3]); (a) Arjun (b) Meera (c) Kabir (d) Aman
14. 14.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Sunrise", "Stars"];
    show(songs[2]); (a) Kites (b) Sunrise (c) Stars
15. 15.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 1 (c) 0 (d) 2
16. 16.💾 What number does this code show?
    let friends = ["Aman", "Meera", "Riya"];
    friends.push("Zoya");
    show(friends.length);
17. 17.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 5;
    show(score);
18. 18.💾 What is a variable? (a) a phone setting (b) a type of screen (c) a picture (d) a named box for a value
19. 19.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Sunrise", "Stars", "Rain", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Rain (c) Stars (d) Monsoon
20. 20.💾 What number does this code show?
    let points = 4;
    points = points - 4;
    points = points + 1;
    show(points);
21. 21.Which of these fits saving in the cloud? (a) your last game level (b) a shared to-do list (c) a draft you are typing (d) the sound on/off setting
22. 22.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Art", "Science"];
    show(notes[1]); (a) Science (b) Art (c) Maths (d) Hindi
23. 23.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
24. 24.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
25. 25.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Stars", "Sunrise", "Kites"];
    show(songs[3]); (a) Kites (b) Rain (c) Sunrise (d) Stars
26. 26.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Music", "Sports", "Science"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Science (d) Music
27. 27.Which of these fits saving in the cloud? (a) your last game level (b) chat messages to friends (c) the sound on/off setting (d) notes to read offline
28. 28.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Maths", "Art", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Music (c) Maths (d) Hindi
29. 29.True or false: notes to read offline fits saving on the phone. (a) False (b) True
30. 30.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Aman", "Meera", "Riya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Arjun (c) Riya (d) Meera
31. 31.💾 What number does this code show?
    let notes = ["Maths", "Science", "Sports", "Hindi"];
    notes.push("Art");
    show(notes.length);
32. 32.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the phone is lost (c) you send a message (d) the app is closed
33. 33.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Art", "Maths", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Maths (c) Hindi (d) Music
34. 34.True or false: your last game level fits saving on the phone. (a) True (b) False
35. 35.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
36. 36.True or false: your last game level fits saving in the cloud. (a) False (b) True
37. 37.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
38. 38.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
39. 39.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Kabir", "Riya"];
    show(friends[1]); (a) Kabir (b) Riya (c) Meera (d) Aman
40. 40.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Science", "Maths"];
    notes.push("Sports");
    show(notes.length);

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