binding.js

// Tested in Node.js v0.10.2

// * RESULTS *

// native bind with context x 696,362 ops/sec ±2.23% (84 runs sampled)
// native bind with context and arg x 672,228 ops/sec ±1.90% (86 runs sampled)

// custom bind with context x 1,186,009 ops/sec ±1.21% (98 runs sampled)
// custom bind with context and arg x 1,202,547 ops/sec ±1.28% (94 runs sampled)

// native bind invoke with 0 args and 0 curried args x 4,070,850 ops/sec ±0.81% (95 runs sampled)
// native bind invoke with 1 arg and 0 curried args x 3,666,720 ops/sec ±1.06% (97 runs sampled)
// native bind invoke with 0 args and 1 curried arg x 3,643,223 ops/sec ±1.22% (93 runs sampled)
// native bind invoke with 1 arg and 1 curried arg x 2,891,898 ops/sec ±0.86% (100 runs sampled)

// custom bind invoke with 0 args and 0 curried args x 15,214,179 ops/sec ±2.86% (90 runs sampled)
// custom bind invoke with 1 arg and 0 curried args x 6,188,506 ops/sec ±1.71% (95 runs sampled)
// custom bind invoke with 0 args and 1 curried arg x 9,247,504 ops/sec ±4.27% (86 runs sampled)
// custom bind invoke with 1 arg and 1 curried arg x 856,811 ops/sec ±2.51% (90 runs sampled)

// * TESTS *

var assert = require('assert')
var Benchmark = require('benchmark');
var suite = new Benchmark.Suite;

var firstArg = 1;
var secondArg = 2;
function testFunc(arg1, arg2) {}
function wrap(f, context, var_args) {
  var args = Array.prototype.slice.call(arguments, 2)

  if (args.length) {
    // may have to merge args
    return function(var_args) {
      var applyArgs = arguments.length ? args.concat(Array.prototype.slice.call(arguments, 0)) : args
      return f.apply(context, applyArgs);
    }
  } else {
    // no merging of args, just use the context + input args
    return function(var_args) {
      return context || arguments.length ? f.apply(context, arguments) : f()
    }
  }
}

var nativeBinds = {
  withContext: testFunc.bind(null),
  withContextAndArg: testFunc.bind(null, firstArg)
}
var customBinds = {
  withContext: wrap(testFunc, null),
  withContextAndArg: wrap(testFunc, null, firstArg)
}

// native binding tests
suite.add('native bind with context', function() {
  testFunc.bind(null)
})
.add('native bind with context and arg', function() {
  testFunc.bind(null, firstArg)
})

// custom binding tests
suite.add('custom bind with context', function() {
  wrap(testFunc, null)
})
.add('custom bind with context and arg', function() {
  wrap(testFunc, null, firstArg)
})

// custom bind invocation tests
.add('native bind invoke with 0 args and 0 curried args', function() {
  nativeBinds.withContext()
})
.add('native bind invoke with 1 arg and 0 curried args', function() {
  nativeBinds.withContext(secondArg)
})
.add('native bind invoke with 0 args and 1 curried arg', function() {
  nativeBinds.withContextAndArg()
})
.add('native bind invoke with 1 arg and 1 curried arg', function() {
  nativeBinds.withContextAndArg(secondArg)
})

// custom bind invocation tests
.add('custom bind invoke with 0 args and 0 curried args', function() {
  customBinds.withContext()
})
.add('custom bind invoke with 1 arg and 0 curried args', function() {
  customBinds.withContext(secondArg)
})
.add('custom bind invoke with 0 args and 1 curried arg', function() {
  customBinds.withContextAndArg()
})
.add('custom bind invoke with 1 arg and 1 curried arg', function() {
  customBinds.withContextAndArg(secondArg)
})

// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.run()