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Lightweight and easy to use timing decorators in JavaScript

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# Timely - Lightweight timing of JavaScript functions

When developing in JavaScript you often find yourself in situations where you want to measure the time it takes for a function to execute. Profilers can find this out but if you just want to measure the time for a function or two you might want to try Timely. Timely doesn't affect the parameters or return values of the functions that it measures. Instead it *decorates*  the existing functions with a timing functionality that is completely transparent to the callers.

## Installation

Node

```bash
npm install timely
```

Browser

```bash
bower install timely
```

## Usage (in Node)

```js
var timely = require('timely'),

// Synchronous function (Fibonacci)
fib = function(n) {
	if (n <= 2) return n;
	return fib(n - 1) + fib(n - 2);
},

// Asynchronous function with callback
wait = function(n, cb) {
	setTimeout(function() {
		cb(n);
	}, 100);
},

// Asynchronous function returning a promise
wait2 = function(n) {
  var defer = when.defer();
	setTimeout(function() {
		defer.resolve(n);
	}, 100);
  return defer.promise;
},

// Create a timed verion of the Synchronous funciton
fibT = timely(fib),
// Create a timed verion of the Asynchronous function with callback
waitT = timely.async(wait),
// Create a timed verion of the Asynchronous function returning a promise
waitT2 = timely.promise(wait2),

// Result of Synchronous function
resultSync;

// Call Synchronous function
resultSync = fibT(35);
//Output results of Synchronous function. fibT.time contains the time used for the last call
console.log('fib(35) = ' + resultSync + ', time: ' + fibT.time + 'ms');

// Call Asynchronous function with callback
waitT(42, function(resultAsync) {
	//Output results of Asynchronous function. waitT.time contains the time used for the last call
	console.log('wait(42) = ' + resultAsync + ', time: ' + waitT.time + 'ms');
});

// Call Asynchronous function returning a promise
waitT2(42).then(function(resultAsync) {
	//Output results of Asynchronous function. waitT2.time contains the time used for the last call
	console.log('wait2(42) = ' + resultAsync + ', time: ' + waitT2.time + 'ms');
});
```
### Outputs:

```js
fib(35) = 14930352, time: 201ms
wait(42) = 42, time: 101ms
wait2(42) = 42, time: 102ms
```

## Demo
To run Node demo:

```bash
node demo.js
```
    
To run Browser demo:

```bash
Open demo.html in your favorite browser
```

## API
* [timely](#timely)
* [timely.async](#timely.async)
* [timely.promise](#timely.promise)

## Functions

<a name="timely"/>
### timely( func )
  
Returns a decorated version of a synchronous function func that measures its execution time. After the function has returned the measured time is available in the returned function's property "time". The mean time of all calls is founcd in the property "meanTime".

__Arguments__

func     {Function} Function to be timed

---------------------------------------

<a name="timely.async"/>
### timely.async( func )
  
Returns a decorated version of an asynchronous function func that measures its execution time. After the callback has been called the measured time is available in the returned function's property "time". It is assumed that the callback is the last parameter of the function func. The mean time of all calls is founcd in the property "meanTime".

__Arguments__

func     {Function} Function to be timed

---------------------------------------

<a name="timely.promise"/>
### timely.promise( func )
  
Returns a decorated version of an asynchronous function func that measures its execution time. After the returned promise has been resolved the measured time is available in the returned function's property "time". The mean time of all calls is founcd in the property "meanTime".

__Arguments__

func     {Function} Function to be timed

---------------------------------------

## Tests

```bash
npm install
npm test
```

## License 
(MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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