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keyFinder

+//Rhino 1.7.7.1
+//https://stackoverflow.com/questions/18619785/counting-frequency-of-characters-in-a-string-using-javascript
+function getFrequency(string) {
+  var freq = {};
+  for (var i = 0; i < string.length; i++) {
+    var character = string.charCodeAt(i) - 65;
+    if (freq[character]) {
+      freq[character]++;
+    } else {
+      freq[character] = 1;
+    }
+  }
+
+  return freq;
+}
+
+function letterFromNum(num){
+  let x = (+num + 65);
+  return String.fromCharCode((x))
+}
+
+function findKey(freq, prob) {
+  let c1 = {};
+  for (var i = 0; i < 26; i++) {
+    let m = 0;
+    for (var j = 0; j < 26; j++) {
+      if (freq[(j + i) % 26]) {
+        m += (prob[j] * freq[(j + i) % 26]) / s1.length;
+      }
+    }
+    c1[i] = m;
+    
+  }
+  return closest(c1, 0.066);
+}
+//https://stackoverflow.com/questions/8584902/get-closest-number-out-of-array
+function closest(array, num) {
+  var i = 0;
+  var minDiff = 1000;
+  var ans;
+  for (i in array) {
+    var m = Math.abs(num - array[i]);
+    if (m < minDiff) {
+      minDiff = m;
+      ans = i;
+    }
+  }
+  return ans;
+}
+
+/*
+function closest(counts, goal){
+  var closest = counts.reduce(function(prev, curr) {
+  return (Math.abs(curr - goal) < Math.abs(prev - goal) ? curr : prev);
+});
+
+console.log(closest);
+}*/
+let probabilies = [
+  0.082,
+  0.015,
+  0.028,
+  0.043,
+  0.127,
+  0.022,
+  0.02,
+  0.061,
+  0.07,
+  0.002,
+  0.008,
+  0.04,
+  0.024,
+  0.067,
+  0.075,
+  0.019,
+  0.001,
+  0.06,
+  0.063,
+  0.091,
+  0.028,
+  0.01,
+  0.023,
+  0.001,
+  0.02,
+  0.001
+];
+let cypher =
+  "KCCPKBGUFDPHQTYAVINRRTMVGRKDNBVFDETDGILTXRGUDDKOTFMBPVGEGLTGCKQRACQCWDNAWCRXIZAKFTLEWRPTYCQKYVXCHKFTPONCQQRHJVAJUWETMCMSPKQDYHJVDAHCTRLSVSKCGCZQQDZXGSFRLSWCWSJTBHAFSIASPRJAHKJRJUMVGKMITZHFPDISPZLVLGWTFPLKKEBDPGCEBSHCTJRWXBAFSPEZQNRWXCVYCGAONWDDKACKAWBBIKFTIOVKCGGHJVLNHIFFSQESVYCLACNVRWBBIREPBBVFEXOSCDYGZWPFDTKFQIYCWHJVLNHIQIBTKHJVNPIST";
+
+console.log(cypher);
+
+let keylen = 6;
+
+let s1 = "";
+let s2 = "";
+let s3 = "";
+let s4 = "";
+let s5 = "";
+let s6 = "";
+
+for (var i = 0; i < cypher.length; i = i + 6) {
+  s1 = s1 + cypher.charAt(i);
+}
+for (var i = 1; i < cypher.length; i = i + 6) {
+  s2 = s2 + cypher.charAt(i);
+}
+for (var i = 2; i < cypher.length; i = i + 6) {
+  s3 = s3 + cypher.charAt(i);
+}
+for (var i = 3; i < cypher.length; i = i + 6) {
+  s4 = s4 + cypher.charAt(i);
+}
+for (var i = 4; i < cypher.length; i = i + 6) {
+  s5 = s5 + cypher.charAt(i);
+}
+for (var i = 5; i < cypher.length; i = i + 6) {
+  s6 = s6 + cypher.charAt(i);
+}
+let f1 = getFrequency(s1);
+let f2 = getFrequency(s2);
+let f3 = getFrequency(s3);
+let f4 = getFrequency(s4);
+let f5 = getFrequency(s5);
+let f6 = getFrequency(s6);
+
+console.log(letterFromNum(findKey(f1, probabilies)))
+console.log(letterFromNum(findKey(f2, probabilies)))
+console.log(letterFromNum(findKey(f3, probabilies)))
+console.log(letterFromNum(findKey(f4, probabilies)))
+console.log(letterFromNum(findKey(f5, probabilies)))
+console.log(letterFromNum(findKey(f6, probabilies)))