A for loop is a control structure used by many programming languages to iterate over a range. It is a way of repeating statements a number of times until the loop ends. Depending on the language this may be over a range of integers, iterators, etc.

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Stop. For the next 30 days, don’t write any for loops. If you see a nasty pile of those gnarly things, replace them with an each or a map. Do a little reducing.