ContextQMD
Back to Freecodecamp

Build a Fortune Teller

curriculum/challenges/english/blocks/lab-fortune-teller/66c06d618d075c7f7f1b890a.md

latest4.5 KB
Original Source

--description--

In this lab, you will define five fortunes and randomly select one of them to display the fortune to the user.

Objective: Fulfill the user stories below and get all the tests to pass to complete the lab.

User Stories:

  1. You should initialize the five variables fortune1, fortune2, fortune3, fortune4, and fortune5 with a string value of your choice. You can use the below options if you like:

    • "Your cat will look very cuddly today."
    • "The weather will be nice tomorrow."
    • "Be cautious of your new neighbors."
    • "You will find a new hobby soon."
    • "It would be wise to avoid the color red today."

  2. You should select a random number between 1 and 5, inclusive, and assign it to the variable randomNumber.

  3. You should create a selectedFortune variable and assign the appropriate fortune based on these rules:

    • If randomNumber is 1, assign the value of fortune1 to selectedFortune.
    • If randomNumber is 2, assign the value of fortune2 to selectedFortune.
    • If randomNumber is 3, assign the value of fortune3 to selectedFortune.
    • If randomNumber is 4, assign the value of fortune4 to selectedFortune.
    • If randomNumber is 5, assign the value of fortune5 to selectedFortune.

  4. You should log the selectedFortune to the console.

--hints--

You should initialize fortune1 with a string value.

js
assert.isNotNull(fortune1);
assert.isString(fortune1);

You should initialize fortune2 with a string value.

js
assert.isNotNull(fortune2);
assert.isString(fortune2);

You should initialize fortune3 with a string value.

js
assert.isNotNull(fortune3);
assert.isString(fortune3);

You should initialize fortune4 with a string value.

js
assert.isNotNull(fortune4);
assert.isString(fortune4);

You should initialize fortune5 with a string value.

js
assert.isNotNull(fortune5);
assert.isString(fortune5);

You should use the Math.random() method to generate a random number.

js
assert.match(__helpers.removeJSComments(code), /Math\.random\(\)/);

You should generate a random number between 1 and 5, inclusive, and assign it to the variable randomNumber.

js
assert.isNotNull(randomNumber);
const originalRandom__test_code__ = Math.random;
try {
  const mockValues__test_code__ = [0.0, 0.2, 0.4, 0.6, 0.8];
  let callCount__test_code__ = 0;
  Math.random = () => mockValues__test_code__[callCount__test_code__++ % mockValues__test_code__.length]
  const userCode__test_code__ = new Function(`${code};return randomNumber`);
  for (let i = 0; i < 5; i++) {
    const result = userCode__test_code__()
    assert.strictEqual(result, i + 1);
  }
} finally {
  Math.random = originalRandom__test_code__;
}

You should have a selectedFortune variable that is assigned a value based on the value of randomNumber.

js
assert.isNotNull(selectedFortune);

The randomNumber should correspond to its fortune. For example, if randomNumber is 1, the selectedFortune should be equal to fortune1 and so on.

js
const originalRandom__test_code__ = Math.random;
try {
  const mockValues__test_code__ = [0.0, 0.2, 0.4, 0.6, 0.8];
  let callCount__test_code__ = 0;
  Math.random = () => mockValues__test_code__[callCount__test_code__++ % mockValues__test_code__.length];
  const fortunes__test_code__ = [fortune1, fortune2, fortune3, fortune4, fortune5,];
  const userCode__test_code__ = new Function(`${code};return selectedFortune`);
  for (let i = 0; i < 5; i++) {
    const result = userCode__test_code__();
    assert.strictEqual(result, fortunes__test_code__[i]);
  }
} finally {
  Math.random = originalRandom__test_code__;
}

You should output the selectedFortune to the console.

js
assert.match(__helpers.removeJSComments(code), /console\s*\.\s*log\s*\(\s*selectedFortune\s*\)\s*;?/);

--seed--

--seed-contents--

js

--solutions--

js
const fortune1 = "Your cat will look very cuddly today.";
const fortune2 = "The weather will be nice tomorrow.";
const fortune3 = "Be cautious of your new neighbors.";
const fortune4 = "You will find a new hobby soon.";
const fortune5 = "It would be wise to avoid the color red today.";

let randomNumber = Math.floor(Math.random() * 5) + 1;

let selectedFortune;

if (randomNumber === 1) {
  selectedFortune = fortune1;
} else if (randomNumber === 2) {
  selectedFortune = fortune2;
} else if (randomNumber === 3) {
  selectedFortune = fortune3;
} else if (randomNumber === 4) {
  selectedFortune = fortune4;
} else {
  selectedFortune = fortune5;
}

console.log(selectedFortune);