Data commit

Task/Ackermann-function/JavaScript/ackermann-function-4.js

@@ -0,0 +1,26 @@
+#!/usr/bin/env nodejs
+function ack(M, N){
+	const next = new Float64Array(M + 1);
+	const goal = new Float64Array(M + 1).fill(1, 0, M);
+	const n = N + 1;
+
+	// This serves as a sentinel value;
+	// next[M] never equals goal[M] == -1,
+	// so we don't need an extra check for
+	// loop termination below.
+	goal[M] = -1;
+
+	let v;
+	do {
+		v = next[0] + 1;
+		let m = 0;
+		while (next[m] === goal[m]) {
+			goal[m] = v;
+			next[m++]++;
+		}
+		next[m]++;
+	} while (next[M] !== n);
+	return v;
+}
+var args = process.argv;
+console.log(ack(parseInt(args[2]), parseInt(args[3])));