mergeObjects: merge array elements according to given certain key/value

mergeObjects.js

// Given this array:
var arr = [
  {
    "pais": "Chile",
    "herramienta": "GTalk, Mailchimp",
    "fecha": "ayer"
  },
  {
     "pais": "Argentina",
     "herramienta": "JIRA, Mailchimp",
     "fecha": "hoy"
  },
  {
     "pais": "Chile",
     "herramienta": "Mailchimp, GMail, Asa Na",
     "fecha": "hoy"
  }
];
// I want to select all values "herramienta" thay belongs to "pais" named "Chile"

function mergeObjects(arr,keyName,keyValue,keyResult){
  var items = [];
  arr.forEach(function(n){
    if( n[keyName] === keyValue ){
      item = n[keyResult].replace(/\s/g, '').split(',');
      items = items.concat( item );
    }
  });
  return items;
}

test.js

console.log( mergeObjects(arr,'pais','Chile','herramienta') );
// result: ["GTalk", "Mailchimp", "Mailchimp", "GMail", "AsaNa"]