Nodejs Utililty Methods Array Find Object

Array.prototype.findObject = function (value, key) {
    var found = false;
    for (var i = 0; i < this.length; i++) {
        if (this[i][key] == value) {
            found = true;
    return found;
};
...

Array.prototype.findObject = function (value, key) {
  var found = -1;
  for (var i = 0; i < this.length; i++) {
    if (this[i][key] == value) {
      found = this[i];
  return found;
};
...

Array.prototype.findObject = function (value, key) {
    var my_obj = null;
    for (var i = 0; i < this.length; i++) {
        if (this[i][key] == value) {
            my_obj = this[i];
    return my_obj;
};
...

Array.prototype.findObjectByName = function (nameOfObj) {
  for(var i=0; i<this.length;i++ ){ 
      if(this[i].name==nameOfObj){
        return this[i];
  return null;