text: 'use strict';
  
  const utility = require('./lib/utils');
  
  let test = [1,2,3,4,5];
  let mapTest = function(x) {
    return x * 3;
  };
  let filterTest = function(x) {
    return (x % 2 === 0);
  };
  let reduceTest = function(x) {
    return x;
  };
  console.log(utility.map(test, mapTest));
  console.log(utility.filter(test, filterTest));
  console.log(utility.reduce(test, reduceTest));
  