App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 965 · 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 in the cloud. (a) False (b) True
2. 2.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a cloud backup (d) a shared chat
3. 3.💾 What number does this code show?
   let stars = 3;
   stars = stars - 1;
   stars = stars + 1;
   show(stars);
4. 4.💾 What does this code show? (Positions start at 0.)
   let friends = ["Kabir", "Riya", "Aman", "Zoya"];
   show(friends[0]); (a) Zoya (b) Riya (c) Aman (d) Kabir
5. 5.True or false: photos on two devices fits saving on the phone. (a) False (b) True
6. 6.💾 What number does this code show?
   let score = 9;
   score = score - 2;
   score = score + 4;
   show(score);
7. 7.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
8. 8.💾 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
9. 9.💾 pop() takes off the last item. What does this code show?
   let notes = ["Maths", "Music", "Art", "Hindi"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Maths (b) Art (c) Music (d) Hindi
10. 10.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Rain", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Rain (b) Stars (c) Kites
11. 11.💾 What number does this code show?
    let notes = ["Maths", "Science", "Sports", "Music"];
    notes.push("Art");
    show(notes.length);
12. 12.Which of these fits saving in the cloud? (a) your last game level (b) notes to read offline (c) the sound on/off setting (d) a shared to-do list
13. 13.💾 What number does this code show?
    let notes = ["Art", "Sports", "Maths"];
    notes.push("Music");
    notes.push("Science");
    show(notes.length);
14. 14.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) skip the internet (d) never need a password
15. 15.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
16. 16.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
17. 17.💾 What number does this code show?
    let notes = ["Maths", "Art"];
    notes.push("Hindi");
    show(notes.length);
18. 18.💾 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
19. 19.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Science", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Music (c) Hindi
20. 20.💾 What number does this code show?
    let lives = 8;
    lives = lives - 1;
    lives = lives + 2;
    show(lives);
21. 21.True or false: your last game level fits saving on the phone. (a) True (b) False
22. 22.💾 What number does this code show?
    let notes = ["Sports", "Art"];
    notes.push("Science");
    show(notes.length);
23. 23.💾 What number does this code show?
    let friends = ["Kabir", "Aman"];
    friends.push("Riya");
    friends.push("Arjun");
    show(friends.length);
24. 24.Which of these fits saving in the cloud? (a) a draft you are typing (b) chat messages to friends (c) notes to read offline (d) the sound on/off setting
25. 25.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Ocean", "Sunrise", "Stars"];
    show(songs[2]); (a) Stars (b) Ocean (c) Sunrise (d) Kites
26. 26.💾 What number does this code show?
    let friends = ["Riya", "Meera"];
    friends.push("Zoya");
    friends.push("Aman");
    show(friends.length);
27. 27.💾 What number does this code show?
    let songs = ["Sunrise", "Rain"];
    songs.push("Kites");
    songs.push("Stars");
    show(songs.length);
28. 28.💾 What number does this code show?
    let notes = ["Maths", "Sports"];
    notes.push("Science");
    notes.push("Art");
    show(notes.length);
29. 29.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Hindi", "Sports"];
    show(notes[3]); (a) Art (b) Hindi (c) Maths (d) Sports
30. 30.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a list (d) a button
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Maths", "Art", "Hindi", "Science"];
    show(notes[1]); (a) Hindi (b) Sports (c) Maths (d) Art
32. 32.Which of these fits saving in the cloud? (a) a class leaderboard (b) your last game level (c) notes to read offline (d) a draft you are typing
33. 33.💾 What number does this code show?
    let songs = ["Monsoon", "Kites", "Sunrise"];
    songs.push("Stars");
    show(songs.length);
34. 34.💾 What number does this code show?
    let songs = ["Rain", "Monsoon", "Sunrise"];
    songs.push("Ocean");
    show(songs.length);
35. 35.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 0 (c) 1 (d) 10
36. 36.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
37. 37.💾 What number does this code show?
    let songs = ["Stars", "Ocean"];
    songs.push("Kites");
    show(songs.length);
38. 38.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
39. 39.💾 What number does this code show?
    let coins = 5;
    coins = coins - 2;
    coins = coins + 3;
    show(coins);
40. 40.💾 What number does this code show?
    let notes = ["Sports", "Art", "Science"];
    notes.push("Hindi");
    show(notes.length);

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