App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 428 · 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.True or false: notes to read offline fits saving on the phone. (a) False (b) True
3. 3.💾 pop() takes off the last item. What does this code show?
   let songs = ["Kites", "Sunrise", "Ocean", "Monsoon", "Rain"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Ocean (b) Kites (c) Monsoon (d) Sunrise
4. 4.💾 pop() takes off the last item. What does this code show?
   let songs = ["Ocean", "Rain", "Kites"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Ocean (b) Kites (c) Rain
5. 5.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
6. 6.💾 What is a variable? (a) a type of screen (b) a named box for a value (c) a phone setting (d) a picture
7. 7.💾 What number does this code show?
   let coins = 8;
   coins = coins - 3;
   coins = coins + 2;
   show(coins);
8. 8.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
9. 9.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
10. 10.💾 What number does this code show?
    let songs = ["Rain", "Ocean", "Sunrise", "Stars"];
    songs.push("Kites");
    songs.push("Monsoon");
    show(songs.length);
11. 11.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 1 (c) 2 (d) 0
12. 12.💾 What number does this code show?
    let songs = ["Rain", "Sunrise", "Ocean", "Monsoon"];
    songs.push("Kites");
    songs.push("Stars");
    show(songs.length);
13. 13.💾 What number does this code show?
    let notes = ["Music", "Sports", "Art"];
    notes.push("Science");
    notes.push("Hindi");
    show(notes.length);
14. 14.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
15. 15.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) a shared to-do list (d) a draft you are typing
16. 16.Which of these fits saving in the cloud? (a) notes to read offline (b) a draft you are typing (c) photos on two devices (d) your last game level
17. 17.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
18. 18.💾 What number does this code show?
    let points = 5;
    points = points - 5;
    points = points + 2;
    show(points);
19. 19.💾 What number does this code show?
    let songs = ["Sunrise", "Kites", "Rain", "Ocean"];
    songs.push("Monsoon");
    show(songs.length);
20. 20.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
21. 21.💾 What number does this code show?
    let stars = 8;
    stars = stars - 5;
    stars = stars + 1;
    show(stars);
22. 22.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a list (d) a button
23. 23.💾 What number does this code show?
    let points = 6;
    points = points - 1;
    points = points + 3;
    show(points);
24. 24.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Zoya", "Kabir", "Meera"];
    show(friends[1]); (a) Meera (b) Arjun (c) Zoya (d) Kabir
25. 25.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 1;
    show(score);
26. 26.Which of these fits saving in the cloud? (a) a class leaderboard (b) a draft you are typing (c) notes to read offline (d) the sound on/off setting
27. 27.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
28. 28.💾 What number does this code show?
    let notes = ["Music", "Maths", "Science"];
    notes.push("Sports");
    notes.push("Art");
    show(notes.length);
29. 29.💾 What number does this code show?
    let lives = 7;
    lives = lives - 5;
    lives = lives + 2;
    show(lives);
30. 30.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a draft you are typing (c) your last game level (d) chat messages to friends
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Art", "Maths"];
    show(notes[1]); (a) Hindi (b) Maths (c) Art
32. 32.Which of these fits saving on the phone? (a) notes to read offline (b) a shared to-do list (c) chat messages to friends (d) a class leaderboard
33. 33.💾 What does this code show? (Positions start at 0.)
    let friends = ["Meera", "Aman", "Arjun"];
    show(friends[0]); (a) Aman (b) Meera (c) Arjun
34. 34.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
35. 35.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Zoya", "Meera"];
    show(friends[1]); (a) Zoya (b) Meera (c) Aman
36. 36.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a shared chat (c) a cloud backup (d) data saved on the phone
37. 37.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Music", "Art"];
    show(notes[1]); (a) Music (b) Maths (c) Hindi (d) Art
39. 39.💾 What number does this code show?
    let stars = 6;
    stars = stars - 4;
    stars = stars + 2;
    show(stars);
40. 40.💾 What number does this code show?
    let friends = ["Arjun", "Riya", "Kabir", "Meera"];
    friends.push("Aman");
    friends.push("Zoya");
    show(friends.length);

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