console: timeEnd printf-like support

[fredericosilva]

Hello,

I've made a small patch to allow us to use format on timeEnd.

console.time('Found %d places');
console.timeEnd('Found %d places', 2);

> Found 2 places: 262.450ms

console.time('Found %d places and %d faces');
console.timeEnd('Found %d places and %d faces', 2, 5);

> Found 2 places and 5 faces: 801.239ms

It's useful to profile and log at the same time.

What do you guys think about it?

[Trott]

My opinion only, but it's probably not a good long-term plan to extend console in ways that make it incompatible with the browser. There are at least two pitfalls:

• Right now, if you cut and paste a console.time()/console.timeEnd() pair from Node into the browser (or if you are using browserify or something similar to run Node code in the browser), it will work. If we extend those functions in ways that don't work in the browser, then that's not necessarily true anymore.
• If Node extends console.timeEnd() and then, at a later date, browsers extend console.timeEnd() in an incompatible way, then we have a difficult choice to make: Break everyone's existing Node code to be compatible with browsers, or have an implementation that fails to align with browsers.

[ChALkeR]

-1 until this either becomes documented in a standard or gets implemented in at least 2 major browser engines.

[targos]

Also -1 from me, for the same reasons. A userland module can easily provide this functionality (and more!).

[fredericosilva]

Also -1 after your feedback. Thanks