array-write-out.js

(function() {
  'use strict';
  
  function arrayWriteOut(arr, process) {
    if (!process) {
      process = function(str) {
        return str;
      };
    }
    
    var result = '';
    for (var i=0; i < arr.length; i++) {
      if (i > 0) {
        if (i < arr.length - 1) {
          result += ', ';
        } else {
          result += ' and ';
        }
      }
      result += process.call(null, arr[i], i);
    }
    return result;
  }
  
  if (typeof module !== 'undefined' && module.exports) {
    module.exports = arrayWriteOut;
  } else {
    window.arrayWriteOut = arrayWriteOut;
  }
}());

example.js

function doubleQuote(str) {
  return '"' + str + '"';
}

arrayWriteOut(['Apple', 'Orange', 'Blueberry'], doubleQuote);
//=> "Apple", "Orange" and "Blueberry"