---
id: 69a890af247de743333bd4cd
title: "Challenge 224: Coffee Roast Detector"
challengeType: 28
dashedName: challenge-224
---

# --description--

Given a string representing the beans used to make a cup of coffee, determine the roast of the cup.

- The given string will contain the following characters, each representing a type of bean:

  - An apostrophe (`'`) is a light roast bean worth 1 point each.
  - A dash (`-`) is a medium roast bean worth 2 points each.
  - A period (`.`) is a dark roast bean worth 3 points each.

- The roast level is determined by the average of all the beans.

Return:

- `"Light"` if the average is less than 1.75.
- `"Medium"` if the average is 1.75 to 2.5.
- `"Dark"` if the average is greater than 2.5.

# --hints--

`detectRoast("''-''''''-'-''--''''")` should return `"Light"`.

```js
assert.equal(detectRoast("''-''''''-'-''--''''"), "Light");
```

`detectRoast(".'-''-''..'''.-.-''-")` should return `"Medium"`.

```js
assert.equal(detectRoast(".'-''-''..'''.-.-''-"), "Medium");
```

`detectRoast("--.''--'-''.--..-.--")` should return `"Medium"`.

```js
assert.equal(detectRoast("--.''--'-''.--..-.--"), "Medium");
```

`detectRoast("-...'-......-..-...-")` should return `"Dark"`.

```js
assert.equal(detectRoast("-...'-......-..-...-"), "Dark");
```

`detectRoast(".--.-..-......----.'")` should return `"Medium"`.

```js
assert.equal(detectRoast(".--.-..-......----.'"), "Medium");
```

`detectRoast("..-..-..-..-....-.-.")` should return `"Dark"`.

```js
assert.equal(detectRoast("..-..-..-..-....-.-."), "Dark");
```

`detectRoast("-'-''''''..-'.''-'.'")` should return `"Light"`.

```js
assert.equal(detectRoast("-'-''''''..-'.''-'.'"), "Light");
```

# --seed--

## --seed-contents--

```js
function detectRoast(beans) {

  return beans;
}
```

# --solutions--

```js
function detectRoast(beans) {
  let total = 0;

  for (const bean of beans) {
    if (bean === "'") total += 1;
    else if (bean === "-") total += 2;
    else if (bean === ".") total += 3;
  }

  const avg = total / beans.length;

  if (avg < 1.75) return "Light";
  if (avg <= 2.5) return "Medium";
  return "Dark";
}
```