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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 318 · 40 questions
TalentJR

Developer's tip (Plan, design, build, check): Find the topic: what apps are, designing apps, or logic and building. Read every screen, list or code line carefully, top to bottom. For code, write each value down step by step and check it again.

NameDateTime takenScore ___ / 40
  1. 1.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(1));
  2. 2.🔁 What number does this code show?
    let scores = [1, 8, 9];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
  3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 36 px tall
    Start button: 60 px tall
    Send button: 60 px tall     (a) Send (b) Next (c) Start
  4. 4.🔀 What number does this shop app show?
    let total = 710;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  5. 5.👆 The user taps the button 5 times. What number does the label show now?
    let stars = 1;
    button.onTap = function () {
      stars = stars + 3;
      label.text = stars;
    };
  6. 6.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 50; // start at 50
    line 2: coins = coins + 7; // add 4
    line 3: coins = coins - 2; // take away 2
    line 4: show(coins); // show it
  7. 7.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
  8. 8.🐞 What is a good first step when an app gives a wrong result? (a) delete the app (b) add more colours (c) buy a new phone (d) find where it goes wrong
  9. 9.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
  10. 10.Which of these app ideas solves no real problem? (a) a free study-room finder (b) a library due-date alert (c) a page of random dots (d) a medicine reminder
  11. 11.📊 Survey: which problem bugs you most? How many students voted in all?
    forgetting birthdays: 4 votes
    forgetting homework: 17 votes
    losing water bottles: 6 votes
  12. 12.🚀 Your app is at version 2.4.2. The next release is a big redesign that changes how the app works. What is its version number? (a) 2.5.2 (b) 2.4.3 (c) 2.5.0 (d) 3.0.0
  13. 13.🗒️ Version 1 of a quiz app must be ready in 12 days. How many days are left for extras after the must-haves?
    show a question: 1 days
    check the answer: 4 days
    show the score: 2 days
  14. 14.🎨 UI stands for user ___. (a) interface (b) input (c) internet (d) idea
  15. 15.🖼️ How many parts (boxes) does this wireframe have?
    [ Add button ]
    [ tab bar ]
    [ big picture ]
    [ title text ]
  16. 16.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [slider] Brightness
    [text box] City
    [switch] Sound
    [text box] Age
    [text box] Notes
    [button] Send
    [button] Start
    [button] Done     (a) Notes (b) Start (c) City (d) Age
  17. 17.🛠️ At which stage do you add the buttons? (a) the test stage (b) the release stage (c) the idea stage (d) the build stage
  18. 18.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 31; // start at 31
    line 2: stars = stars + 2; // double it
    line 3: stars = stars - 3; // take away 3
    line 4: stars = stars + 4; // add 4
    line 5: show(stars); // show it
  19. 19.🗒️ A to-do app with no “add a task” feature is ___. (a) missing a must-have (b) ready to release (c) well planned (d) a nice extra
  20. 20.💾 What number does this code show?
    let score = 8;
    score = score - 5;
    score = score + 3;
    show(score);
  21. 21.Which of these fits saving on the phone? (a) a shared to-do list (b) the sound on/off setting (c) chat messages to friends (d) a class leaderboard
  22. 22.💾 What number does this code show?
    let points = 3;
    points = points - 3;
    points = points + 4;
    show(points);
  23. 23.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let coins = 43; // start at 40
    line 2: coins = coins + 4; // add 4
    line 3: coins = coins * 2; // double it
    line 4: coins = coins * 2; // double it
    line 5: show(coins); // show it     (a) line 3 (b) line 1 (c) line 2 (d) line 4
  24. 24.🔍 Which is the odd one out? (a) a spelling coach (b) a water reminder (c) a times-table quiz (d) a flashcard trainer
  25. 25.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 32; // start at 32
    line 2: stars = stars + 2; // double it
    line 3: stars = stars + 2; // add 2
    line 4: show(stars); // show it
  26. 26.👆 The user taps the button 6 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    };     (a) OFF (b) ON
  27. 27.🔀 What does this PIN rule show?
    let pin = "316";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  28. 28.True or false: a countdown hits zero is a timer event. (a) False (b) True
  29. 29.True or false: a word battle is a game. (a) False (b) True
  30. 30.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
  31. 31.✏️ A box with a cross in a wireframe usually means ___. (a) an error (b) a picture goes here (c) delete this (d) a closed app
  32. 32.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 48; // start at 45
    line 2: points = points - 5; // take away 5
    line 3: points = points + 3; // add 3
    line 4: show(points); // show it
  33. 33.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(1) + points(2));
  34. 34.🚀 Which version is newer: 2.6.14 or 2.6.7? (a) 2.6.14 (b) 2.6.7
  35. 35.🎯 Is this a user need or a feature: a share button? (a) a user need (b) a feature
  36. 36.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 60;
    }
    show(fee(3) + fee(8));
  37. 37.True or false: “big touch targets” makes the app harder to use. (a) True (b) False
  38. 38.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(34));
  39. 39.♿ Accessibility means an app works for ___. (a) only experts (b) only the coder (c) nobody (d) everyone
  40. 40.👆 The user taps the button 5 times. What number does the label show now?
    let score = 10;
    button.onTap = function () {
      score = score + 5;
      label.text = score;
    };

Answer key

  1. 50
  2. 9
  3. Next
  4. 660
  5. 16
  6. 55
  7. False
  8. find where it goes wrong
  9. easy to read
  10. a page of random dots
  11. 27
  12. 3.0.0
  13. 5
  14. interface
  15. 4
  16. Start
  17. the build stage
  18. 63
  19. missing a must-have
  20. 6
  21. the sound on/off setting
  22. 4
  23. line 1
  24. a water reminder
  25. 36
  26. OFF
  27. Use 4 digits
  28. True
  29. True
  30. poor design
  31. a picture goes here
  32. 43
  33. 40
  34. 2.6.14
  35. a feature
  36. 60
  37. False
  38. 68
  39. everyone
  40. 35

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