flatmap/index.js

The missing flatMap function for Node

"use strict";

module.exports = function(arr, iter, context) {
  var results = [];
  if (!Array.isArray(arr)) return results;
  arr.forEach(function(value, index, list) {
    var res = iter.call(context, value, index, list);
    if (Array.isArray(res)) {
      results.push.apply(results, res);
    } else if (res != null) {
      results.push(res);
    }
  });
  return results;
};