In xcode if you put your mouse over a function it highlights the function, and puts a tooltip with its name next to your mouse. It's sometimes useful to quickly

In xcode if you put your mouse over a function it highlights the function, and puts a tooltip with its name next to your mouse. It's sometimes useful to quickly see what a given class contains and see how complicated it is (based on lines of code and number of indentations). You could argue it's highly situational, but IMO it's nice to always be able to see how complicated your codebase is getting, tech debt is no joke