Node.jsはWindows Script Hostよりどれくらい高速ですか？ そして、これは私たちに何を教えてくれますか？

// CScript to Node.js: if (typeof WScript == "undefined") WScript = {}; if (typeof WScript.Echo == "undefined") WScript.Echo = function(){ var i; var log = ''; for (i=0; i < arguments.length; i++){ log += arguments[i]; } console.log(log); } var fannkuch = function(n) { var p = [], q = [], s = [], sign = 1, maxflips = 0, sum = 0; var i; for(i=1; i<=n; i++) p[i] = q[i] = s[i] = i; for(;;){ // Copy and flip. var q1 = p[1]; // Cache 1st element. if(q1 != 1){ for(i=2; i<=n; i++) q[i] = p[i]; // Work on a copy. var flips = 1; for(;;){ var qq = q[q1]; if(qq == 1){ // ... until 1st element is 1. sum = sum + sign*flips; if(flips > maxflips){ maxflips = flips; } // New maximum? break; } q[q1] = q1; if(q1 >= 4){ var i = 2, j = q1 - 1 for(;;){ var tmp = q[i]; q[i] = q[j]; q[j] = tmp; if(++i >= --j) break; } } q1 = qq; flips++; } } // Permute. if(sign == 1){ var tmp = p[2]; p[2] = p[1]; p[1] = tmp; sign = -1; // Rotate 1<-2. }else{ var tmp = p[2]; p[2] = p[3]; p[3] = tmp; sign = 1; // Rotate 1<-2 and 1<-2<-3. for(i = 3;; i++){ // print "mark 4" var sx = s[i]; if(sx != 1){ s[i] = sx-1; break; } if(i == n) return [sum, maxflips]; // Out of permutations. s[i] = i; // Rotate 1<-...<-i+1. var t = p[1]; for(var j = 1; j <= i; j++){ p[j] = p[j+1]; } p[i+1] = t; } } } } function getTimeSec(){ var d = new Date(); return (d.getTime() + d.getMilliseconds() / 1000.0) / 1000.0; } var n = 10; var start_time = getTimeSec(); var r = fannkuch(n); var sum = r[0], flips = r[1]; WScript.Echo( sum,"\n", "Pfannkuchen(",n,") = ",flips,"\n", "time = ",(getTimeSec() - start_time),"\n" )