public/subjects/using-map/README.md

## Using Map

### Instructions

Create the following functions:

> Your solutions **must** use `map`.


#### Cities Only
`citiesOnly`: accepts an array of objects and returns an array of strings from the `city` key.
```js
citiesOnly([
  {
    city: 'Los Angeles',
    temperature: '  101 °F   ',
  },
  {
    city: 'San Francisco',
    temperature: ' 84 ° F   ',
  },
]) // -> ['Los Angeles', 'San Francisco']
```

#### Upper Casing States
`upperCasingStates`: accepts an array of strings, and returns a new array of strings. The returned array will be the same as the argument, except the first letter of every word must be capitalized.
```js
upperCasingStates(['alabama', 'new jersey']) // -> ['Alabama', 'New Jersey']
```

#### Fahrenheit to Celsius
`fahrenheitToCelsius`: accepts an array of fahrenheit temperatures as strings, and returns an array of strings converted to celsius. Round down the result.
```js
fahrenheitToCelsius(['68°F', '59°F', '25°F']) // -> ['20°C', '15°C', '-4°C']
```

#### Trim Temp
`trimTemp`: accepts an array of objects, and returns a new array of objects with the same structure. The `temperature` strings must have their spaces removed in the new array.
```js
trimTemp([
  { city: 'Los Angeles', temperature: '  101 °F   ' },
  { city: 'San Francisco', temperature: ' 84 ° F   ' },
]) /* -> [
  { city: 'Los Angeles', temperature: '101°F' },
  { city: 'San Francisco', temperature: '84°F' },
] */
```

#### Temp Forecasts
`tempForecasts`: accepts an array of objects, and returns an array of formatted strings. See the example below:
```js
tempForecasts([
  {
    city: 'Pasadena',
    temperature: ' 101 °F',
    state: 'california',
    region: 'West',
  },
]) // -> ['38°Celsius in Pasadena, California']
```


### Notions

- [Array.prototype.map](https://devdocs.io/javascript/global_objects/array/map)