App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 773 · 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 notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
3. 3.💾 What does this code show? (Positions start at 0.)
   let songs = ["Sunrise", "Kites", "Monsoon"];
   show(songs[2]); (a) Monsoon (b) Kites (c) Sunrise
4. 4.💾 What number does this code show?
   let friends = ["Riya", "Meera"];
   friends.push("Kabir");
   show(friends.length);
5. 5.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Sports", "Science", "Maths"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Music (d) Science
6. 6.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the screen turns off (c) the app is closed (d) the phone is lost
7. 7.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) shrink the app (d) skip the internet
8. 8.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
9. 9.💾 What number does this code show?
   let score = 5;
   score = score - 4;
   score = score + 1;
   show(score);
10. 10.💾 What number does this code show?
    let notes = ["Art", "Maths", "Sports"];
    notes.push("Hindi");
    show(notes.length);
11. 11.💾 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
12. 12.💾 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
13. 13.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
14. 14.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a shared chat (d) a cloud backup
15. 15.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
16. 16.Which of these fits saving in the cloud? (a) a draft you are typing (b) a class leaderboard (c) notes to read offline (d) the sound on/off setting
17. 17.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) chat messages to friends (d) a draft you are typing
18. 18.💾 What number does this code show?
    let lives = 3;
    lives = lives - 2;
    lives = lives + 3;
    show(lives);
19. 19.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 1 (d) 10
20. 20.💾 What number does this code show?
    let lives = 8;
    lives = lives - 3;
    lives = lives + 5;
    show(lives);
21. 21.💾 What number does this code show?
    let songs = ["Monsoon", "Rain", "Sunrise"];
    songs.push("Stars");
    songs.push("Ocean");
    show(songs.length);
22. 22.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Sports", "Music", "Science"];
    show(notes[4]); (a) Maths (b) Hindi (c) Sports (d) Science
23. 23.💾 What number does this code show?
    let coins = 3;
    coins = coins - 3;
    coins = coins + 5;
    show(coins);
24. 24.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
25. 25.💾 What number does this code show?
    let friends = ["Arjun", "Meera"];
    friends.push("Aman");
    show(friends.length);
26. 26.💾 What number does this code show?
    let score = 8;
    score = score - 3;
    score = score + 3;
    show(score);
27. 27.💾 What is a variable? (a) a phone setting (b) a named box for a value (c) a type of screen (d) a picture
28. 28.True or false: photos on two devices fits saving on the phone. (a) False (b) True
29. 29.💾 pop() takes off the last item. What does this code show?
    let notes = ["Hindi", "Science", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Art (c) Hindi
30. 30.💾 What number does this code show?
    let notes = ["Art", "Maths"];
    notes.push("Hindi");
    show(notes.length);
31. 31.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
32. 32.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) a shared to-do list (d) notes to read offline
33. 33.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Stars", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Rain (c) Stars
34. 34.💾 What number does this code show?
    let coins = 3;
    coins = coins - 2;
    coins = coins + 2;
    show(coins);
35. 35.Which of these fits saving on the phone? (a) a class leaderboard (b) notes to read offline (c) chat messages to friends (d) photos on two devices
36. 36.💾 Which can hold many values in order? (a) a single number (b) a button (c) a switch (d) a list
37. 37.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
38. 38.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
39. 39.💾 What number does this code show?
    let score = 7;
    score = score - 1;
    score = score + 4;
    show(score);
40. 40.💾 What number does this code show?
    let songs = ["Monsoon", "Stars", "Kites"];
    songs.push("Ocean");
    show(songs.length);

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