App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 767 · 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 chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
2. 2.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 0 (c) 2 (d) 10
3. 3.True or false: notes to read offline fits saving on the phone. (a) False (b) True
4. 4.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
5. 5.True or false: your last game level fits saving in the cloud. (a) False (b) True
6. 6.💾 What number does this code show?
   let songs = ["Sunrise", "Kites", "Monsoon"];
   songs.push("Stars");
   songs.push("Rain");
   show(songs.length);
7. 7.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) use it on any device (c) skip the internet (d) never need a password
8. 8.💾 What number does this code show?
   let coins = 4;
   coins = coins - 1;
   coins = coins + 2;
   show(coins);
9. 9.Which of these fits saving in the cloud? (a) your last game level (b) a draft you are typing (c) chat messages to friends (d) the sound on/off setting
10. 10.💾 Which can hold many values in order? (a) a switch (b) a list (c) a single number (d) a button
11. 11.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
12. 12.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Art", "Hindi", "Sports"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Science (b) Hindi (c) Sports (d) Art
13. 13.💾 What number does this code show?
    let score = 3;
    score = score - 2;
    score = score + 3;
    show(score);
14. 14.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
15. 15.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Maths", "Art", "Sports", "Science"];
    show(notes[1]); (a) Maths (b) Sports (c) Hindi (d) Art
16. 16.💾 What number does this code show?
    let score = 5;
    score = score - 4;
    score = score + 3;
    show(score);
17. 17.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) your last game level (d) a shared to-do list
18. 18.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 2;
    show(score);
19. 19.💾 What is a variable? (a) a phone setting (b) a named box for a value (c) a picture (d) a type of screen
20. 20.True or false: a class leaderboard fits saving on the phone. (a) True (b) False
21. 21.💾 What number does this code show?
    let score = 6;
    score = score - 3;
    score = score + 4;
    show(score);
22. 22.💾 What number does this code show?
    let notes = ["Sports", "Art"];
    notes.push("Maths");
    show(notes.length);
23. 23.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) a draft you are typing (d) a shared to-do list
24. 24.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
25. 25.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) on the phone (b) in the cloud
26. 26.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
27. 27.💾 What number does this code show?
    let coins = 3;
    coins = coins - 1;
    coins = coins + 5;
    show(coins);
28. 28.True or false: photos on two devices fits saving in the cloud. (a) True (b) False
29. 29.💾 What number does this code show?
    let points = 6;
    points = points - 6;
    points = points + 2;
    show(points);
30. 30.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Kites", "Monsoon", "Stars", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Stars (c) Monsoon (d) Kites
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Music", "Science", "Sports", "Art", "Maths"];
    show(notes[0]); (a) Sports (b) Art (c) Science (d) Music
32. 32.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Rain", "Sunrise", "Ocean", "Stars"];
    show(songs[0]); (a) Sunrise (b) Ocean (c) Rain (d) Kites
33. 33.💾 What number does this code show?
    let notes = ["Art", "Maths", "Sports", "Hindi"];
    notes.push("Science");
    show(notes.length);
34. 34.💾 pop() takes off the last item. What does this code show?
    let songs = ["Ocean", "Kites", "Rain", "Monsoon"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Ocean (b) Rain (c) Monsoon (d) Kites
35. 35.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
36. 36.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Kites", "Monsoon"];
    show(songs[2]); (a) Monsoon (b) Kites (c) Stars
37. 37.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
38. 38.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
39. 39.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) on the phone (b) in the cloud
40. 40.Which of these fits saving on the phone? (a) a class leaderboard (b) photos on two devices (c) chat messages to friends (d) notes to read offline

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