gistfile1.js

var PI = Math.pi;

function f0(x) {
  return PI / x;
}

function f1(x) {
  if (x != 0) {
    return PI / x;
  } else {
    return -1;
  }
}

function f2(x) {
  try {
    return PI / x;
  } catch(e) {
    return -1;
  }
}

function run(f) {
  var t = process.hrtime();
  for (var i=0; i<10000; i++) {
    for (var j=1; j<100; j++) {
      f(j);
    }
  }
  t = process.hrtime(t);
  return t[1] / 1000 / 1000 / 1000;
}

function choice(ops) {
  return ops[Math.floor(Math.random() * ops.length)];
}

funcs = [f0, f1, f2];
times = {};
funcs.forEach(function(f) {
  times[f.name] = [];
});
for (var i=0; i < 100; i++) {
  f = choice(funcs);
  times[f.name].push(run(f));
}
function sum(items) {
  var t = 0;
  for (var i=0; i<items.length; i++) {
    t += items[i];
  }
  return t;
}
for (k in times) {
  console.log(k, sum(times[k]));
}