timeMe!

Time a block of code with minimal effort.

Sometimes you want to time a certain execution path to see its performance. So, you add a bunch of time captures and log statements. Cleaning them up isn't so much fun. It would also be nice to leave them in your code so they can be enabled at will. timeMe is meant to help in that situation.

timeMe Will take some options and a function to wrap. It will return the wrapped function. Everytime that function is executed, its time will be recorded. You can choose to print it out, or query the function for its lastTime.

In the case of Promise based functions, timeMe will wait until the Promise resolves, log the time it took to resolve, and then pass the promise back.

Usage

timeMe.configure({
  log: function(msg, msgObj) { console.log(msg); }
});

var foo = timeMe.async('foo()', function(cb) {
  setTimeout(function() {
      cb(null, '25');
  }, 2000);
});
foo(function(err, result) {
  console.log(result);
});

// outputs:
// foo() 2000ms
// 25


// using with Promises
var foo = timeMe.promise('foo()', function() {
  return new Promise(function(res, rej) {
    setTimeout(function() {
      res('26');
    }, 1000);
  });
});
var p = foo();
p.then(function(result) {
  console.log(result);
})

// outputs:
// foo() 1000ms
// 26

Methods

timeMe.configure

Globally configure the module on what log function to use. Defaults to console.log

timeMe.configure({
  log: function(msg, obj) { // do logging here }
});

The configured logging function will be passed two arguments:

1. A string containing the message used to name the call, and the call time.

2. An object containing the same information, of the form

   {
       prefix: string // prefix message
       elapsed: number // elapsed time in milliseconds
   }

timeMe.async

timeMe.sync

timeMe.promise

All three methods can be called like so

timeMe.async('a prefex', fn);
timeMe.async(fn); // default prefix of `timeMe`
timeMe.async({msg: 'foo()', index: 1}, fn); // options hash for more fine grained control
timeMe.promise(promiseBasedFn);

Options

options.msg

The prefix of the logged time

options.index

(only for timeMe.async) You can specify the index of the callback in the wrapped function. Defaults to the last argument.

options.noLog

Turn logs on or off. Defaults to false (meaning logging on).

wrappedFn.lastTime

Whenever a wrapped function is called, additionally to logging the time, a property will be set on the function: lastTime. You can query the function for the property.