Loop through

To process each element of a list of things.

"Hold on, I've got to loop through my paper mail."

Derives from the computer-language notion of an iterative loop; compare "cdr down" (under cdr), which is less common among C and Unix programmers.

ITS hackers used to say "IRP over" after an obscure pseudo-op in the MIDAS PDP-10 assembler.

[Jargon File]

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