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Re: regex and "Functional Programming"

by BrowserUk (Pope)
on Oct 22, 2004 at 23:13 UTC ( #401722=note: print w/replies, xml ) Need Help??

in reply to regex and "Functional Programming"

In it's simplest terms, functional programming is programming without side-effects. Functions take inputs and produce outputs, but the inputs are not modifed. Crudely, pass by value rather than pass by reference.

Traditionally, regex modify their targets in-place rather then producing a modified copy of the original. I don't think that there is any technical reason why a regex-like find & replace facility couldn't be implemented in the functional style. Except maybe efficency, but as many will express, that can be a double edged sword.

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

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Re^2: regex and "Functional Programming"
by diotalevi (Canon) on Oct 26, 2004 at 15:20 UTC

    JavaScript does this already.

    ... = foo.replace( / regex /g, 'replacement' );

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