App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 576 · 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 the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 What number does this code show?
   let friends = ["Zoya", "Aman", "Riya"];
   friends.push("Arjun");
   friends.push("Meera");
   show(friends.length);
3. 3.Which of these fits saving in the cloud? (a) notes to read offline (b) a shared to-do list (c) a draft you are typing (d) your last game level
4. 4.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
5. 5.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
6. 6.💾 What is a variable? (a) a named box for a value (b) a type of screen (c) a picture (d) a phone setting
7. 7.💾 pop() takes off the last item. What does this code show?
   let friends = ["Aman", "Zoya", "Kabir"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Kabir (b) Zoya (c) Aman
8. 8.💾 What number does this code show?
   let coins = 8;
   coins = coins - 1;
   coins = coins + 3;
   show(coins);
9. 9.💾 pop() takes off the last item. What does this code show?
   let notes = ["Music", "Hindi", "Science"];
   notes.pop();
   show(notes[notes.length - 1]); (a) Hindi (b) Music (c) Science
10. 10.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
11. 11.💾 What number does this code show?
    let stars = 9;
    stars = stars - 4;
    stars = stars + 1;
    show(stars);
12. 12.Which of these fits saving in the cloud? (a) your last game level (b) a class leaderboard (c) the sound on/off setting (d) notes to read offline
13. 13.💾 What number does this code show?
    let stars = 9;
    stars = stars - 1;
    stars = stars + 2;
    show(stars);
14. 14.💾 What number does this code show?
    let lives = 3;
    lives = lives - 1;
    lives = lives + 4;
    show(lives);
15. 15.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) notes to read offline (d) a class leaderboard
16. 16.💾 What number does this code show?
    let friends = ["Arjun", "Meera", "Kabir", "Zoya"];
    friends.push("Aman");
    friends.push("Riya");
    show(friends.length);
17. 17.💾 What number does this code show?
    let friends = ["Zoya", "Riya", "Arjun", "Aman"];
    friends.push("Kabir");
    friends.push("Meera");
    show(friends.length);
18. 18.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) chat messages to friends (d) notes to read offline
19. 19.💾 What number does this code show?
    let lives = 5;
    lives = lives - 1;
    lives = lives + 4;
    show(lives);
20. 20.💾 What number does this code show?
    let lives = 6;
    lives = lives - 2;
    lives = lives + 1;
    show(lives);
21. 21.💾 What number does this code show?
    let songs = ["Sunrise", "Stars", "Ocean"];
    songs.push("Kites");
    songs.push("Monsoon");
    show(songs.length);
22. 22.True or false: photos on two devices fits saving on the phone. (a) True (b) False
23. 23.💾 What number does this code show?
    let songs = ["Ocean", "Rain", "Sunrise"];
    songs.push("Kites");
    show(songs.length);
24. 24.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) photos on two devices (d) the sound on/off setting
25. 25.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Stars", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Kites (b) Ocean (c) Stars
26. 26.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 0 (d) 10
27. 27.💾 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
28. 28.💾 What number does this code show?
    let stars = 9;
    stars = stars - 9;
    stars = stars + 1;
    show(stars);
29. 29.💾 pop() takes off the last item. What does this code show?
    let friends = ["Kabir", "Aman", "Meera", "Riya", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Meera (b) Kabir (c) Riya (d) Aman
30. 30.💾 What number does this code show?
    let notes = ["Art", "Music"];
    notes.push("Hindi");
    show(notes.length);
31. 31.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) never need a password (d) use it on any device
32. 32.💾 Which can hold many values in order? (a) a button (b) a list (c) a switch (d) a single number
33. 33.💾 What number does this code show?
    let songs = ["Stars", "Ocean"];
    songs.push("Sunrise");
    show(songs.length);
34. 34.💾 What number does this code show?
    let notes = ["Art", "Sports"];
    notes.push("Science");
    show(notes.length);
35. 35.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Stars", "Kites", "Rain", "Monsoon"];
    show(songs[4]); (a) Stars (b) Monsoon (c) Kites (d) Sunrise
36. 36.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Sports", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Maths (c) Sports
38. 38.💾 What number does this code show?
    let notes = ["Music", "Art"];
    notes.push("Maths");
    show(notes.length);
39. 39.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
40. 40.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False

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