Logic Problems

Open Weather API

Consider the version of their API that allows you to request information based on a named location instead of Lat/Long details. Their documentation shows three versions of an API call where you can use certain combinations of city name, state code and country code.

City Name Only

https://api.openweathermap.org/data/2.5/weather?q={city name}&appid={API key}

City and Country

https://api.openweathermap.org/data/2.5/weather?q={city name},{country code}&appid={API key}

City, State and Country

https://api.openweathermap.org/data/2.5/weather?q={city name},{state code},{country code}&appid={API key}

Given the pattern above, create a generalized function that could assemble the query string portion of the URL from a single object input. You may presume that the input data has been verified for correctness beforehand (e.g.: not missing the city name or app id).

View Solution

If you know something about object deconstruction syntax and the built-in array functions in JavaScript, then you might find it can be solved quite easily without needing any if/else statements. Here’s one possible solution.

const buildQueryString = ({city, state, country, appId}) => {
  const queryParts = [city, state, country];
  const queryValue = queryParts.filter(item => !!item).join(',');
  return `?q=${queryValue}&appid=${appId}`;
}