Check if a string (first argument) ends with the given target string (second argument).

ending.js

function end(str, target) {
  // "Never give up and good luck will find you."
  // -- Falcor
  var tagLen = target.length;
  var str_len = ((-str.length) + tagLen );
  
  var sub_str = str.substr(-tagLen, tagLen);

  if(target == sub_str){
    return true;
  }else{
    return false;
  }
  
}
//calling the function. will return true
end("Falcon", "on");