filter array string values by keyword.js

var arr = [];

var testValues = function(value) {
  return /keyword_here/.test(value);
};

var addPrefix = function(value) {
  return 'prefix '+value;
};

var links = document.querySelectorAll('a');
;(function() {
  for (var i = 0; i < links.length; i++) {
    var link = links[i].toString();
    arr.push(link);
  }
})();

var filteredArray = arr.filter(testValues);
var filteredArrayWithPrefixes = filteredArray.map(addPrefix);