At a deeper level, this comes down to internal vs. external iteration, and, more generally, how languages weave together concurrent threads of execution: https

At a deeper level, this comes down to internal vs. external iteration, and, more generally, how languages weave together concurrent threads of execution: https://journal.stuffwithstuff.com/2013/01/13/iteration-inside-and-out/ https://journal.stuffwithstuff.com/2013/01/13/iteration-insi...