Product filtering

solution.js

//Installed node modules: jquery underscore request express jade shelljs passport http sys lodash async mocha moment connect validator restify ejs ws co when helmet wrench brain mustache should backbone forever debug

process.stdin.resume();
process.stdin.setEncoding('utf8');
var util = require('util');
var input = "";

process.stdin.on('data', function (text) {
  input += text;
});

process.stdin.on('end', function () {
  const data = JSON.parse(input);
  const filteredProducts = getFilteredProducts(data);
  console.log(JSON.stringify(filteredProducts));
});

/// solution start -- 3. added edge case handling + code comments

const getFilteredProducts = data => {
  
  // we default to empty arrays so we don't blow up if 
  // either of these are not present in the input file
  const { products = [], exclusions = [] } = data;

  // a product should be excluded if there exists some exclusion element
  // such that its `key` and `value` values match any of the given product object's key-value pairs.
  const isExcluded = product =>
    Object.entries(product).some(([key, value]) =>
      exclusions.some(excl => excl.key === key && excl.value === value)
  );  

  const filteredProducts = products.filter(product => !isExcluded(product));
  return filteredProducts;
};