App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 693 · 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.💾 What does this code show? (Positions start at 0.)
   let friends = ["Aman", "Kabir", "Riya", "Meera", "Zoya"];
   show(friends[3]); (a) Meera (b) Kabir (c) Aman (d) Riya
2. 2.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Maths", "Art", "Science", "Sports"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Maths (b) Music (c) Art (d) Science
3. 3.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) a draft you are typing (d) chat messages to friends
4. 4.💾 What number does this code show?
   let score = 3;
   score = score - 1;
   score = score + 3;
   show(score);
5. 5.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
6. 6.💾 pop() takes off the last item. What does this code show?
   let notes = ["Science", "Sports", "Music"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Science (b) Music (c) Sports
7. 7.💾 What number does this code show?
   let points = 5;
   points = points - 3;
   points = points + 1;
   show(points);
8. 8.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
9. 9.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) a class leaderboard (d) notes to read offline
10. 10.Which of these fits saving on the phone? (a) the sound on/off setting (b) a class leaderboard (c) photos on two devices (d) a shared to-do list
11. 11.💾 Saving data in the cloud lets you ___. (a) never need a password (b) use it on any device (c) skip the internet (d) shrink the app
12. 12.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
13. 13.💾 What does this code show? (Positions start at 0.)
    let notes = ["Science", "Hindi", "Art"];
    show(notes[1]); (a) Hindi (b) Art (c) Science
14. 14.💾 Which works with no internet at all? (a) a cloud backup (b) a cloud leaderboard (c) data saved on the phone (d) a shared chat
15. 15.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
16. 16.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Aman", "Meera", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Aman (c) Zoya (d) Riya
17. 17.💾 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
18. 18.Which of these fits saving in the cloud? (a) a class leaderboard (b) your last game level (c) the sound on/off setting (d) a draft you are typing
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Art", "Sports", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Art (d) Hindi
20. 20.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
21. 21.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Maths", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Hindi (c) Maths (d) Art
22. 22.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Aman", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Kabir (c) Meera
23. 23.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) a shared to-do list (d) a draft you are typing
24. 24.💾 What is a variable? (a) a named box for a value (b) a phone setting (c) a picture (d) a type of screen
25. 25.💾 What number does this code show?
    let notes = ["Art", "Hindi"];
    notes.push("Science");
    notes.push("Sports");
    show(notes.length);
26. 26.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
27. 27.💾 What number does this code show?
    let notes = ["Maths", "Sports", "Music", "Science"];
    notes.push("Hindi");
    notes.push("Art");
    show(notes.length);
28. 28.💾 What number does this code show?
    let notes = ["Art", "Science", "Music"];
    notes.push("Sports");
    show(notes.length);
29. 29.💾 pop() takes off the last item. What does this code show?
    let friends = ["Meera", "Riya", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Zoya (c) Meera
30. 30.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Rain", "Stars", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Rain (c) Stars (d) Kites
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Science", "Sports", "Maths", "Music"];
    show(notes[0]); (a) Maths (b) Sports (c) Hindi (d) Science
32. 32.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) chat messages to friends (d) your last game level
33. 33.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
34. 34.💾 What number does this code show?
    let songs = ["Kites", "Monsoon"];
    songs.push("Stars");
    songs.push("Ocean");
    show(songs.length);
35. 35.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Maths", "Hindi", "Science", "Art"];
    show(notes[3]); (a) Music (b) Maths (c) Hindi (d) Science
36. 36.Which of these fits saving in the cloud? (a) notes to read offline (b) photos on two devices (c) the sound on/off setting (d) your last game level
37. 37.💾 What number does this code show?
    let lives = 6;
    lives = lives - 1;
    lives = lives + 4;
    show(lives);
38. 38.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Zoya", "Kabir"];
    show(friends[1]); (a) Riya (b) Kabir (c) Zoya
39. 39.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 1;
    show(score);
40. 40.💾 What does this code show? (Positions start at 0.)
    let songs = ["Rain", "Ocean", "Monsoon", "Kites"];
    show(songs[1]); (a) Monsoon (b) Ocean (c) Kites (d) Rain

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