This is for anyone using Sublime Text. I have a licensed version, but you can actually use it for free (if you don’t mind a periodic reminder to register). [Endorsement warning…] I find it to be the best light-weight editor I’ve ever used.
In v2, you can take advantage of within-file-goto-function by pressing [ctrl+r].
In v3, set up a project file, set cursor over a function and press F12.
You can also create a key binding so that you can hold ctrl and click with the mouse. Here are instructions for that: