App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 614 · 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.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
2. 2.True or false: photos on two devices fits saving on the phone. (a) False (b) True
3. 3.💾 What number does this code show?
   let notes = ["Sports", "Hindi"];
   notes.push("Music");
   notes.push("Science");
   show(notes.length);
4. 4.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
5. 5.💾 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
6. 6.Which of these fits saving on the phone? (a) photos on two devices (b) notes to read offline (c) chat messages to friends (d) a shared to-do list
7. 7.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
8. 8.💾 What number does this code show?
   let notes = ["Sports", "Art"];
   notes.push("Science");
   notes.push("Maths");
   show(notes.length);
9. 9.💾 What does this code show? (Positions start at 0.)
   let notes = ["Maths", "Science", "Sports", "Art"];
   show(notes[0]); (a) Maths (b) Sports (c) Science (d) Art
10. 10.Which of these fits saving on the phone? (a) chat messages to friends (b) a draft you are typing (c) a shared to-do list (d) photos on two devices
11. 11.💾 What number does this code show?
    let songs = ["Kites", "Rain", "Sunrise", "Ocean"];
    songs.push("Monsoon");
    show(songs.length);
12. 12.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Hindi", "Maths"];
    show(notes[0]); (a) Maths (b) Hindi (c) Sports
13. 13.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Sports", "Music", "Maths"];
    show(notes[1]); (a) Music (b) Sports (c) Maths (d) Hindi
14. 14.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the app is closed (c) you send a message (d) the phone is lost
15. 15.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
16. 16.💾 Which can hold many values in order? (a) a single number (b) a list (c) a button (d) a switch
17. 17.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Science", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Science (c) Art
18. 18.💾 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
19. 19.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
20. 20.Which of these fits saving on the phone? (a) a class leaderboard (b) photos on two devices (c) chat messages to friends (d) the sound on/off setting
21. 21.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Stars", "Ocean", "Sunrise", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Stars (b) Ocean (c) Kites (d) Sunrise
22. 22.💾 Which works with no internet at all? (a) data saved on the phone (b) a cloud leaderboard (c) a cloud backup (d) a shared chat
23. 23.True or false: notes to read offline fits saving on the phone. (a) True (b) False
24. 24.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Hindi", "Art", "Science"];
    show(notes[1]); (a) Science (b) Art (c) Maths (d) Hindi
25. 25.💾 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
26. 26.💾 In most code, the first item of a list is at position ___. (a) 0 (b) 1 (c) 10 (d) 2
27. 27.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
28. 28.💾 What number does this code show?
    let score = 8;
    score = score - 2;
    score = score + 3;
    show(score);
29. 29.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Science", "Music", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Sports (c) Science (d) Music
30. 30.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
31. 31.💾 What number does this code show?
    let friends = ["Riya", "Arjun"];
    friends.push("Aman");
    friends.push("Kabir");
    show(friends.length);
32. 32.💾 What is a variable? (a) a phone setting (b) a picture (c) a named box for a value (d) a type of screen
33. 33.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Sunrise", "Rain"];
    songs.push("Kites");
    songs.push("Stars");
    show(songs.length);
34. 34.💾 What number does this code show?
    let songs = ["Stars", "Monsoon"];
    songs.push("Rain");
    show(songs.length);
35. 35.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
36. 36.💾 What number does this code show?
    let points = 8;
    points = points - 5;
    points = points + 2;
    show(points);
37. 37.💾 pop() takes off the last item. What does this code show?
    let notes = ["Music", "Sports", "Maths", "Art", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Art (c) Sports (d) Maths
38. 38.💾 What number does this code show?
    let lives = 6;
    lives = lives - 3;
    lives = lives + 1;
    show(lives);
39. 39.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) chat messages to friends (d) your last game level
40. 40.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students