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2 definitions found
 for loop through
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  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 (the same IRP op can nowadays be
      found in Microsoft's assembler).

From The Free On-line Dictionary of Computing (30 December 2018) :

  loop through
      A sequence of instructions in a program that
     the processor repeats, either until some condition is met, or
     indefinitely (an infinite loop).
     In an structured language (e.g. C, Pascal, BASIC, or
     Fortran), a loop is usually achieved with for loop, while
     loop or repeat loop constructs.
     In other languages these constructs may be synthesised with a
     jump+({assembly+language">jump ({assembly language) or a GOTO (early Fortran or
     To "loop through" a list means to process each element in turn.
     Hackers might use this for everyday iterative actions, e.g.  "I've
     got to loop through my paper mail."

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