_readme.md

reasonml pattern matching in javascript...as best it can be

match.js

const invalidMatchSignal = new Error();

function makeProxyThrower(input) {
  return new Proxy(input, {
    get(target, prop, receiver) {
      if (prop in target) {
        const result = Reflect.get(target, prop, receiver);
        if (typeof result === 'object' && result !== null) {
          return makeProxyThrower(result);
        }
        return result;
      }
      throw invalidMatchSignal;
    }
  });
}

export function match(input = {}, ...patterns) {
  const safeInput = Object.keys(input).length ? input : { error: '' };

  const param = makeProxyThrower(safeInput);
  for (const pattern of patterns) {
    try {
      return pattern(param);
    } catch (e) {
      if (e !== invalidMatchSignal) {
        throw e;
      }
    }
  }
  throw new Error('No match for input');
}