early-return-perf-test.js

#! /usr/env/node --allow-natives-syntax 
// Generated by CoffeeScript 1.8.0
(function() {
  var N, asyncOp, callerEarlyReturn, callerIfElse, getStatus, ntimes, testFN;

  N = 10000;

  asyncOp = function(cb) {
    var err, out;
    out = Math.random();
    if (out > 0.9) {
      err = new Error('err');
      out = null;
    } else {
      err = null;
    }
    return setTimeout((function() {
      return cb(err, out);
    }), 1);
  };

  callerEarlyReturn = function(callback) {
    return asyncOp(function(err, out) {
      if (err) {
        return callback(err);
      }
      return callback(null, out * out);
    });
  };

  callerIfElse = function(callback) {
    return asyncOp(function(err, out) {
      if (err) {
        return callback(err);
      } else {
        return callback(null, out * out);
      }
    });
  };

  ntimes = function(fn, done) {
    var i, step;
    i = N;
    return (step = function() {
      if (i === 0) {
        return done();
      } else {
        i -= 1;
        return fn(function() {
          return step();
        });
      }
    })();
  };

  testFN = function(code, fn, done) {
    return fn(function() {
      console.log('1');
      %OptimizeFunctionOnNextCall(fn);
      return fn(function() {
        console.log('2');
        getStatus(fn);
        console.time(code);
        return ntimes(fn, function() {
          console.timeEnd(code);
          return done();
        });
      });
    });
  };

  getStatus = function(fn) {
    switch (%GetOptimizationStatus(fn)) {
      case 1:
        return console.log("Function is optimized");
      case 2:
        return console.log("Function is not optimized");
      case 3:
        return console.log("Function is always optimized");
      case 4:
        return console.log("Function is never optimized");
      case 6:
        return console.log("Function is maybe deoptimized");
    }
  };

  testFN('return', callerEarlyReturn, function() {
    return testFN('ifelse', callerIfElse, function() {});
  });

}).call(this);

result

node --allow-natives-syntax early-return-perf-test.js 
1
2
Function is optimized
return: 11835ms
1
2
Function is optimized
ifelse: 11958ms
node --allow-natives-syntax early-return-perf-test.js 
1
2
Function is optimized
return: 11786ms
1
2
Function is optimized
ifelse: 11892ms