TheIronDev

+               let previousTransactions = localStorage.previousTransactions ? JSON.parse(localStorage.previousTransactions) : [],
+                       amountByCount = previousTransactions.reduce(function(memo, transaction) {
+                               var current = memo[transaction.value];
+                               if (!current) {
+                                       current = {
+                                               value: transaction.amount,
+                                               currencyCode: transaction.currencyCode,
+                                               currencySymbol: transaction.currencySymbol,
+                                               count: 0
+                                       };

TheIronDev

!function(e){function t(e,n,i,r,o,a){i>a.largestDepth&&(a.largestDepth=i);var l,d,c={children:[],childElementCount:e.childElementCount,attributes:{},depth:i,end:o,start:r,tagName:e.tagName,parentNode:n,__nodeRef:e.__nodeRef||e},u=e.attributes;if(u instanceof NamedNodeMap){l=u.length||0;for(var s=0;l>s;s++)d=u[s],c.attributes[d.name]=d.value}else c.attributes=e.attributes;e.id&&(c.id=e.id,a.ids[e.id]=c),m[e.tagName]&&m[e.tagName](c,e,a);for(var h,f,p=i+1,g=e.childElementCount,b=(o-r)/g,s=0;g>s;s++)f=r+s*b,h=t(e.children[s],c,p,f,f+b,a),c.children.push(h);return c}function n(e,n,i){var r={body:null,head:null,documentElement:null,ids:{},links:[],images:[],scripts:[],forms:[],largestDepth:0},o=t(e,null,0,n,i,r),a=Object.assign({},o,r);return a}function i(e,t,n){var r=t.tagName,o=t.start+(t.end-t.start)/2,a=t.depth*n+20;t.children.forEach(function(t){var r=t.start+(t.end-t.start)/2,l=t.depth*n+20;e.beginPath(),e.moveTo(o,a),e.lineTo(r,l),e.stroke(),e.closePath(),i(e,t,n)}),e.beginPath(),e.fillStyle=p[r]?p[r]:p.def

TheIronDev

function fibo(n) {
  if (n <= 1) return n;
  return fibo(n-1) + fibo(n-2);
}

function tailFibo(n, tail) {
  if (n <= 1) return n;
  if (tail[n]) return tail[n];
  
  tail[n] = tailFibo(n-1, tail) + tailFibo(n-2, tail);