App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 995 · 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 number does this code show?
   let points = 5;
   points = points - 5;
   points = points + 2;
   show(points);
2. 2.Which of these fits saving in the cloud? (a) notes to read offline (b) a class leaderboard (c) your last game level (d) the sound on/off setting
3. 3.💾 pop() takes off the last item. What does this code show?
   let friends = ["Kabir", "Riya", "Zoya", "Aman", "Arjun"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Kabir (b) Riya (c) Zoya (d) Aman
4. 4.💾 What number does this code show?
   let points = 6;
   points = points - 5;
   points = points + 4;
   show(points);
5. 5.True or false: notes to read offline fits saving on the phone. (a) False (b) True
6. 6.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
7. 7.True or false: your last game level fits saving in the cloud. (a) False (b) True
8. 8.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
9. 9.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 2 (c) 1 (d) 10
10. 10.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) the sound on/off setting (d) photos on two devices
11. 11.Which of these fits saving on the phone? (a) chat messages to friends (b) notes to read offline (c) photos on two devices (d) a class leaderboard
12. 12.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Maths", "Music", "Art", "Sports"];
    show(notes[2]); (a) Music (b) Hindi (c) Art (d) Maths
13. 13.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Maths", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Science (c) Maths
14. 14.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Riya", "Meera"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Meera (c) Aman
15. 15.💾 What number does this code show?
    let stars = 4;
    stars = stars - 1;
    stars = stars + 2;
    show(stars);
16. 16.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Monsoon", "Ocean"];
    show(songs[0]); (a) Monsoon (b) Ocean (c) Sunrise
17. 17.💾 What is a variable? (a) a picture (b) a type of screen (c) a named box for a value (d) a phone setting
18. 18.💾 What number does this code show?
    let notes = ["Hindi", "Science", "Maths", "Art"];
    notes.push("Music");
    notes.push("Sports");
    show(notes.length);
19. 19.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
20. 20.💾 What number does this code show?
    let songs = ["Stars", "Sunrise"];
    songs.push("Ocean");
    show(songs.length);
21. 21.💾 What number does this code show?
    let songs = ["Rain", "Kites"];
    songs.push("Stars");
    songs.push("Sunrise");
    show(songs.length);
22. 22.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Hindi", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Music (c) Maths
23. 23.Which of these fits saving in the cloud? (a) a draft you are typing (b) your last game level (c) the sound on/off setting (d) photos on two devices
24. 24.Which of these fits saving on the phone? (a) photos on two devices (b) a class leaderboard (c) your last game level (d) a shared to-do list
25. 25.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Arjun", "Zoya", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Kabir (c) Zoya (d) Riya
27. 27.💾 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
28. 28.💾 What number does this code show?
    let songs = ["Sunrise", "Monsoon"];
    songs.push("Kites");
    show(songs.length);
29. 29.💾 Which can hold many values in order? (a) a single number (b) a button (c) a switch (d) a list
30. 30.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
31. 31.True or false: your last game level fits saving on the phone. (a) True (b) False
32. 32.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Hindi", "Science", "Maths", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Art (c) Science (d) Maths
33. 33.💾 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
34. 34.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
35. 35.Which of these fits saving in the cloud? (a) a draft you are typing (b) your last game level (c) the sound on/off setting (d) chat messages to friends
36. 36.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
37. 37.💾 What number does this code show?
    let songs = ["Sunrise", "Rain", "Ocean"];
    songs.push("Kites");
    show(songs.length);
38. 38.💾 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
39. 39.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Science", "Hindi", "Sports", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Science (d) Maths
40. 40.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud

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