I guess the foreach is where each iteration has independent operation, vs a generic for loop where this iteration depends on result of the previous iterations.
I joined my current employer for their mission to provide mobile phones in local languages in India. Its a real contribution that helps user on the ground, but I quit after working for them for about eight months, after I realized that not only the localization was more of a marketing point, and that no real work on localization had happened in last two years, but also that people within the company were least bothered about the end product, and more about their own responsibilities. Everyone worked in silos, and management didn't give a damn about it. I am switching sides, and going from a pure server side role to a server side cum embedded systems role to try to change something in the electricity wastage problem.
So to sum up, my current job was taken because company had a mission. I quit it because they didn't stand by that mission in their day to day working. And I joined my next company due to their mission.