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Why Is This Interesting? The Programming Edition

What all of these languages–FORTRAN, C, the UNIX shell sh and its text manipulation tools such as awk, vi and sed–had in common was that they were procedural: you gave a series of commands in a procedure and ordered the computer to carry them out step by step …

In a functional language, in contrast, every statement is a function that takes input and transforms it into a different output, which in some generalized sense is what a program in toto is supposed to do

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