Nodejs Utililty Methods Array Map

Array.prototype.map = Array.prototype.map || function (func) {
    array = [];
    utility.scan(this, function (item) { array.push(func(item)); });
    return array;
};

Array.prototype.map = function(func) {
  var results = [];
  for(var i = 0; i < this.length; i++) {
    var result = func(this[i]);
    results.push(result);
  return results;

Array.prototype.map = function(func) {
    var length = this.length;
    var result = [];
    for ( var i = 0; i < length; i++ ) {
        result.push( func(this[i]) );
    return result;
};

var school = [1, 2, 3, 4, 5, 6, 7, 8, 3, 35, 3, 5];
Array.prototype.map = function(grade) {
  var result = [];
  this.forEach(function(item) {
    result.push(grade(item));
  });
  return result;
};
var a = school.map(function(x) {
...

Array.prototype.map = function (handler) {
    var result = []
    for (var i = 0; i < this.length; i++) {
        result.push(handler(this[i]))
    return result

Array.prototype.map = function(iterator) {
  var results = [];
  for (var i = 0, len = this.length; i < len; i++) {
    results.push(iterator(this[i], i));
  return results;
};

Array.prototype.map = function (iterator, context) {
    baidu.check("function(,.+)?","baidu.array.map");
    var i, n,
        array = baidu.array([]);
    for (i=0, n=this.length; i < n; i++) {
        array[i] = iterator.call(context || this, this[i], i, this);
    return array;
};
...

Array.prototype.map = function(mapper) {
   var result = [];
   for (var i = 0; i < this.length; ++i) {
      result.push(mapper(this[i]));
   return result;
};

Array.prototype.map = function(mappingRelation){
  return this.reduce(function(accumulator, value){
    return accumulator.concat(mappingRelation(value));
  }, []);

Array.prototype.map = function(projectionFunction) {
  var reuslts = [];
  this.forEach(function(itemInArray){
    results.push(projectionFunction(itemInArray));
  })
  return results;