App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 567 · 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 a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) never need a password (d) skip the internet
3. 3.💾 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
4. 4.💾 What number does this code show?
   let lives = 8;
   lives = lives - 8;
   lives = lives + 1;
   show(lives);
5. 5.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
6. 6.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
7. 7.💾 What number does this code show?
   let notes = ["Art", "Maths"];
   notes.push("Music");
   notes.push("Sports");
   show(notes.length);
8. 8.Which of these fits saving on the phone? (a) notes to read offline (b) photos on two devices (c) a shared to-do list (d) chat messages to friends
9. 9.💾 What number does this code show?
   let lives = 7;
   lives = lives - 4;
   lives = lives + 3;
   show(lives);
10. 10.Which of these fits saving on the phone? (a) a class leaderboard (b) chat messages to friends (c) photos on two devices (d) a draft you are typing
11. 11.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 10 (c) 2 (d) 0
12. 12.Which of these fits saving on the phone? (a) photos on two devices (b) a shared to-do list (c) the sound on/off setting (d) a class leaderboard
13. 13.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
14. 14.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Science"];
    show(notes[2]); (a) Art (b) Science (c) Maths
15. 15.💾 What number does this code show?
    let points = 7;
    points = points - 5;
    points = points + 3;
    show(points);
16. 16.Which of these fits saving in the cloud? (a) notes to read offline (b) the sound on/off setting (c) your last game level (d) a shared to-do list
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.💾 What does this code show? (Positions start at 0.)
    let friends = ["Arjun", "Riya", "Aman"];
    show(friends[0]); (a) Aman (b) Arjun (c) Riya
19. 19.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
20. 20.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
21. 21.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
22. 22.True or false: the sound on/off setting fits saving in the cloud. (a) False (b) True
23. 23.💾 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
24. 24.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Maths", "Sports", "Music", "Science"];
    show(notes[1]); (a) Maths (b) Art (c) Music (d) Sports
25. 25.True or false: your last game level fits saving in the cloud. (a) True (b) False
26. 26.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Sports", "Science", "Hindi"];
    show(notes[3]); (a) Hindi (b) Sports (c) Music (d) Science
27. 27.💾 What number does this code show?
    let notes = ["Art", "Sports", "Science"];
    notes.push("Maths");
    notes.push("Music");
    show(notes.length);
28. 28.💾 What number does this code show?
    let points = 3;
    points = points - 1;
    points = points + 3;
    show(points);
29. 29.💾 Which can hold many values in order? (a) a single number (b) a button (c) a switch (d) a list
30. 30.💾 What is a variable? (a) a phone setting (b) a named box for a value (c) a type of screen (d) a picture
31. 31.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a cloud backup (d) a shared chat
32. 32.💾 What number does this code show?
    let notes = ["Sports", "Maths", "Music"];
    notes.push("Science");
    notes.push("Art");
    show(notes.length);
33. 33.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Hindi (b) Art (c) Sports
34. 34.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
35. 35.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Kites", "Sunrise", "Stars"];
    show(songs[1]); (a) Ocean (b) Kites (c) Sunrise (d) Stars
36. 36.💾 What number does this code show?
    let coins = 4;
    coins = coins - 4;
    coins = coins + 1;
    show(coins);
37. 37.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
38. 38.True or false: photos on two devices fits saving on the phone. (a) True (b) False
39. 39.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Rain", "Monsoon", "Kites", "Sunrise"];
    show(songs[2]); (a) Monsoon (b) Ocean (c) Rain (d) Kites
40. 40.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Riya", "Kabir", "Zoya", "Meera"];
    show(friends[2]); (a) Zoya (b) Kabir (c) Aman (d) Riya

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