App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 615 · 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.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
2. 2.💾 pop() takes off the last item. What does this code show?
   let friends = ["Zoya", "Meera", "Kabir", "Riya"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Kabir (b) Riya (c) Meera (d) Zoya
3. 3.Which of these fits saving in the cloud? (a) the sound on/off setting (b) photos on two devices (c) notes to read offline (d) a draft you are typing
4. 4.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) skip the internet (c) use it on any device (d) never need a password
5. 5.💾 pop() takes off the last item. What does this code show?
   let songs = ["Monsoon", "Ocean", "Sunrise", "Rain", "Kites"];
   songs.pop();
   show(songs[songs.length - 1]); (a) Monsoon (b) Ocean (c) Sunrise (d) Rain
6. 6.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
7. 7.True or false: your last game level fits saving in the cloud. (a) False (b) True
8. 8.💾 What does this code show? (Positions start at 0.)
   let notes = ["Maths", "Music", "Sports"];
   show(notes[2]); (a) Maths (b) Music (c) Sports
9. 9.Which of these fits saving in the cloud? (a) notes to read offline (b) chat messages to friends (c) your last game level (d) the sound on/off setting
10. 10.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Rain", "Ocean", "Stars"];
    show(songs[2]); (a) Rain (b) Ocean (c) Stars (d) Sunrise
11. 11.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 2 (c) 10 (d) 0
12. 12.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
13. 13.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Art", "Science"];
    show(notes[0]); (a) Art (b) Hindi (c) Science
14. 14.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
15. 15.💾 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
16. 16.💾 What number does this code show?
    let score = 4;
    score = score - 4;
    score = score + 4;
    show(score);
17. 17.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
18. 18.Which of these fits saving in the cloud? (a) the sound on/off setting (b) a shared to-do list (c) notes to read offline (d) a draft you are typing
19. 19.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Ocean", "Kites", "Rain", "Stars"];
    show(songs[4]); (a) Stars (b) Sunrise (c) Ocean (d) Kites
20. 20.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Sports"];
    notes.push("Science");
    notes.push("Music");
    show(notes.length);
21. 21.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) notes to read offline (d) a shared to-do list
22. 22.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
23. 23.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Maths", "Sports", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Art (c) Science (d) Maths
24. 24.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Ocean", "Monsoon", "Stars"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Stars (c) Monsoon (d) Sunrise
25. 25.💾 pop() takes off the last item. What does this code show?
    let songs = ["Monsoon", "Ocean", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Monsoon (c) Rain
26. 26.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
27. 27.Which of these fits saving on the phone? (a) a class leaderboard (b) a shared to-do list (c) chat messages to friends (d) a draft you are typing
28. 28.💾 Which can hold many values in order? (a) a switch (b) a single number (c) a list (d) a button
29. 29.💾 What number does this code show?
    let songs = ["Ocean", "Rain", "Stars", "Kites"];
    songs.push("Monsoon");
    songs.push("Sunrise");
    show(songs.length);
30. 30.💾 What number does this code show?
    let friends = ["Aman", "Meera"];
    friends.push("Riya");
    friends.push("Arjun");
    show(friends.length);
31. 31.💾 What number does this code show?
    let coins = 9;
    coins = coins - 1;
    coins = coins + 3;
    show(coins);
32. 32.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
33. 33.True or false: your last game level fits saving on the phone. (a) False (b) True
34. 34.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Monsoon", "Stars", "Rain"];
    show(songs[2]); (a) Stars (b) Monsoon (c) Sunrise (d) Rain
35. 35.Which of these fits saving on the phone? (a) photos on two devices (b) the sound on/off setting (c) chat messages to friends (d) a class leaderboard
36. 36.💾 What number does this code show?
    let friends = ["Meera", "Riya"];
    friends.push("Arjun");
    show(friends.length);
37. 37.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) a class leaderboard (d) notes to read offline
38. 38.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Art", "Maths", "Science"];
    show(notes[1]); (a) Hindi (b) Art (c) Science (d) Maths
39. 39.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
40. 40.💾 What number does this code show?
    let points = 6;
    points = points - 3;
    points = points + 5;
    show(points);

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