November 22nd, 2013
My friend and co-worker Panos Astithas was in town the other day, and so
we decided to hack together on some features that we wouldn't normally be
working on in our regular day-to-day. Among them was a new evaluation feature
for the Firefox Developer Tools' Scratchpad that allows you to
evaluate individual top level functions at a time. The command is bound to the
Cmd + E keyboard shortcut and was inspired by SLIME's
slime-compile-defun (C-c C-c) command.
Being able to re-evaluate individual functions at a time enables faster
prototyping. The previous workflow whenever you wanted to edit functions was to
refresh the app, repeat interactions that put the app back into the previous
state, and then finally observe how your changes affected the app. In many
cases, you can avoid this lengthy process by editing your code in the Scratchpad
Cmd + E to re-evaluate individual functions. Re-evaluating
individual functions doesn't refresh the app, and lets it maintain its existing
state. No refreshing or repeated interactions required.
When you re-evaluate a function with
Cmd + E, we flash the function's source
text briefly to provide some visual feedback.
This feature is available in Firefox 28, which is currently in the Nightly release channel.
Naming `eval` Scripts with the `//# sourceURL` Directive on December 5th, 2014
wu.js 2.0 on August 7th, 2014
Come work with me on Firefox Developer Tools on July 8th, 2014
Debugging Web Performance with Firefox DevTools - Velocity 2014 on June 26th, 2014
Beyond Source Maps on March 12th, 2014
Memory Tooling in Firefox Developer Tools in 2014 on March 4th, 2014
Hiding Implementation Details with ECMAScript 6 WeakMaps on January 13th, 2014
Re-evaluate Individual Functions in Firefox Developer Tools' Scratchpad on November 22nd, 2013
Testing Source Maps on October 2nd, 2013
Destructuring Assignment in ECMAScript 6 on August 15th, 2013