App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 208 · 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.💾 pop() takes off the last item. What does this code show?
   let friends = ["Meera", "Arjun", "Zoya", "Riya"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Zoya (b) Arjun (c) Riya (d) Meera
2. 2.💾 What number does this code show?
   let score = 6;
   score = score - 1;
   score = score + 5;
   show(score);
3. 3.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
4. 4.💾 What number does this code show?
   let notes = ["Hindi", "Music"];
   notes.push("Science");
   show(notes.length);
5. 5.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) a draft you are typing (d) a shared to-do list
6. 6.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
7. 7.💾 What number does this code show?
   let friends = ["Riya", "Arjun", "Aman", "Kabir"];
   friends.push("Meera");
   friends.push("Zoya");
   show(friends.length);
8. 8.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 0 (d) 10
9. 9.💾 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
10. 10.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Rain", "Stars", "Ocean", "Kites"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Ocean (c) Rain (d) Stars
11. 11.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
12. 12.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Sunrise", "Rain"];
    show(songs[0]); (a) Sunrise (b) Monsoon (c) Rain
13. 13.💾 What number does this code show?
    let friends = ["Kabir", "Zoya", "Arjun", "Aman"];
    friends.push("Riya");
    friends.push("Meera");
    show(friends.length);
14. 14.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) your last game level (d) photos on two devices
15. 15.💾 Saving data in the cloud lets you ___. (a) never need a password (b) shrink the app (c) use it on any device (d) skip the internet
16. 16.💾 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
17. 17.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Zoya", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Riya (c) Zoya
18. 18.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
19. 19.💾 What does this code show? (Positions start at 0.)
    let notes = ["Sports", "Science", "Hindi", "Music", "Maths"];
    show(notes[0]); (a) Science (b) Sports (c) Hindi (d) Music
20. 20.True or false: the sound on/off setting fits saving in the cloud. (a) True (b) False
21. 21.True or false: a draft you are typing fits saving in the cloud. (a) False (b) True
22. 22.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Riya", "Aman"];
    show(friends[0]); (a) Riya (b) Zoya (c) Aman
23. 23.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Stars", "Kites", "Ocean", "Sunrise"];
    show(songs[1]); (a) Stars (b) Ocean (c) Kites (d) Monsoon
24. 24.💾 pop() takes off the last item. What does this code show?
    let friends = ["Aman", "Meera", "Arjun"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Arjun (b) Aman (c) Meera
25. 25.💾 What number does this code show?
    let points = 8;
    points = points - 4;
    points = points + 4;
    show(points);
26. 26.💾 Which can hold many values in order? (a) a switch (b) a single number (c) a list (d) a button
27. 27.💾 What does this code show? (Positions start at 0.)
    let friends = ["Riya", "Zoya", "Aman"];
    show(friends[2]); (a) Zoya (b) Aman (c) Riya
28. 28.True or false: your last game level fits saving in the cloud. (a) True (b) False
29. 29.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
30. 30.💾 What number does this code show?
    let notes = ["Art", "Maths"];
    notes.push("Science");
    show(notes.length);
31. 31.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
32. 32.💾 What number does this code show?
    let coins = 6;
    coins = coins - 1;
    coins = coins + 5;
    show(coins);
33. 33.True or false: your last game level fits saving on the phone. (a) False (b) True
34. 34.Which of these fits saving on the phone? (a) a class leaderboard (b) photos on two devices (c) chat messages to friends (d) a draft you are typing
35. 35.💾 What is a variable? (a) a picture (b) a named box for a value (c) a type of screen (d) a phone setting
36. 36.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Music", "Hindi", "Maths", "Sports"];
    show(notes[4]); (a) Music (b) Art (c) Hindi (d) Sports
37. 37.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Sports", "Maths", "Art", "Science"];
    show(notes[4]); (a) Hindi (b) Maths (c) Sports (d) Science
38. 38.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
39. 39.💾 What number does this code show?
    let score = 5;
    score = score - 4;
    score = score + 1;
    show(score);
40. 40.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Kites", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Stars (c) Kites

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