Nodejs Utililty Methods String Ends With

var fs = require('fs');
String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};
fs.readdir(process.argv[2], function (err, files) {
    var ext = '.' + process.argv[3];
    for(var i in files) {
        if (files[i].endsWith(ext))
            console.log(files[i]);
...

var fs = require('fs');
String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

String.prototype.endsWith = function (suffix) {
    var str = this;
    return str && str.indexOf(suffix, str.length - suffix.length) !== -1;
};
console.log('foo bar'.endsWith('bas'));
console.log('foo bas'.endsWith('bas'));

String.prototype.endsWith = function(suffix) {
  return this.indexOf(suffix, this.length - suffix.length) !== -1;
};
var fs = require('fs');
var fileName = process.argv[2];
var fileExtension = process.argv[3];
fs.readdir(fileName, function (err, list) {
  if (err) throw err;
  for (var i = 0; i < list.length; i++) {
...

var fs = require('fs');
var path = require('path');
String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};
module.exports = function (dir, ext, callback) {
    fs.readdir(dir, function (err, files) {
        if (err) return callback(err, null);
        return callback(null, files.filter(function(file){
...

String.prototype.endsWith = function (suffix) {
  "use strict";
  if (!suffix && typeof suffix !== 'string') {
    return false;
  var stringPosition = this.length - suffix.length;
  var suffixIndex = this.indexOf(suffix, stringPosition);
  return suffixIndex === stringPosition;
};
...

String.prototype.endsWith = function(suffix) {
  return this.match(suffix+"$") == suffix;
};

'use strict';
String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

String.prototype.endsWith = function (suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;

String.prototype.endsWith = function (suffix) {
  return this.substring(this.length - suffix.length) === suffix;
};