The Computer Language
Benchmarks Game

binary-trees Node.js program

/* The Computer Language Benchmarks Game
   http://benchmarksgame.alioth.debian.org/
   contributed by Isaac Gouy 
   *reset* 
*/

function TreeNode(left,right,item){
   this.left = left;
   this.right = right;
}

TreeNode.prototype.itemCheck = function(){
   if (this.left==null) return 1;
   else return 1 + this.left.itemCheck() + this.right.itemCheck();
}

function bottomUpTree(depth){
   if (depth>0){
      return new TreeNode(
          bottomUpTree(depth-1)
         ,bottomUpTree(depth-1)
      );
   }
   else {
      return new TreeNode(null,null);
   }
}


var minDepth = 4;
var n = +process.argv[2];
var maxDepth = Math.max(minDepth + 2, n);
var stretchDepth = maxDepth + 1;

var check = bottomUpTree(stretchDepth).itemCheck();
console.log("stretch tree of depth " + stretchDepth + "\t check: " + check);

var longLivedTree = bottomUpTree(maxDepth);
for (var depth=minDepth; depth<=maxDepth; depth+=2){
   var iterations = 1 << (maxDepth - depth + minDepth);

   check = 0;
   for (var i=1; i<=iterations; i++){
      check += bottomUpTree(depth).itemCheck();
   }
   console.log(iterations + "\t trees of depth " + depth + "\t check: " + check);
}

console.log("long lived tree of depth " + maxDepth + "\t check: " 
   + longLivedTree.itemCheck());
    

NOTES:
64-bit Ubuntu quad core
v9.4.0


Wed, 10 Jan 2018 18:43:24 GMT

MAKE:
cp -L binarytrees.node binarytrees.js

0.03s to complete and log all make actions

COMMAND LINE:
/opt/src/node-v9.4.0-linux-x64/bin/node binarytrees.js 21

PROGRAM OUTPUT:
stretch tree of depth 22	 check: 8388607
2097152	 trees of depth 4	 check: 65011712
524288	 trees of depth 6	 check: 66584576
131072	 trees of depth 8	 check: 66977792
32768	 trees of depth 10	 check: 67076096
8192	 trees of depth 12	 check: 67100672
2048	 trees of depth 14	 check: 67106816
512	 trees of depth 16	 check: 67108352
128	 trees of depth 18	 check: 67108736
32	 trees of depth 20	 check: 67108832
long lived tree of depth 21	 check: 4194303