decypher niantic crypto text

decypher_niantic.js

/*
 * copy and paste into your browser's console to run and
 * then use like so
 * interprete("Jajwd tujwfynts wjfhmjx f wnxp-fxxjxxrjsy xyflj. Fy ymnx utnsy rd ijyjwrnsfynts nx ymfy snfsynh nx hfzxnsl rtwj ywtzgqj ymfs ny nx btwym")
 */
// simple deciphering scheme
var alphabet = "abcdefghijklmnopqrstuvwxyz";
var sillyAlphabet = "vwxyzabcdefghijklmnopqrstu";
var decrypt = {};

for(var i = 0, limit = alphabet.length; i < limit; i++){ 
  decrypt[alphabet[i]] = sillyAlphabet[i];
}

// enter the encrypted text and tell us what it
// means
// @param {string} jibberish
// @return {string} result
function interprete(jibberish){ 
  var result = [],
      jib = "";
  
  for(var i = 0, limit = jibberish.length; i < limit; i++){ 
    jib = jibberish[i].toLowerCase();

    if( jib && decrypt[jib]){ 
      result.push(decrypt[jib]);
    } else {
      result.push(" ");
    }
  }

  return result.join('');
}

// sanity check that our scheme works
function testInterprete(){
  if(console && console.log){
   console.log( "is" == interprete("nx") );
   console.log( "every" == interprete("jajwd") );
  }
}