Map to JSON

map2json.js

mapToJson = (inputMap) => {
  if (!(inputMap instanceof Map)) {
    throw new Error(`${inputMap} is not a valid Map`);
  }

  const outputObj = {}
  inputMap.forEach((k, v) => {
    return outputObj[v] = k;
  });
  return outputObj;
}


const input = [[1, ['hello', 'world']], ['fnc', () => {console.log('fnc called')}]];
const inputMap = new Map(input);
const toJson = mapToJson(inputMap);

Simple script that converts an ES6 Map to a valid object representation. Map offers some advantages over object. For example, Map is a built-in iterable and provides a more intuitive interface for iterating over elements that do objects. However, objects are easier to consume (I haven't heard of a Map represented API yet ;)).