On 8/19/13 8:58 AM, Jay Fields wrote:
In the past, I've written code like the following
(defn foo [x y]
(let [x-squared (* x x)]
(if (pos? y)
(+ x-squared y)
(- x-squared y))))
However, the introduction of as-> has led me to write the following, at times
(defn foo [x y]
(as-> (* x x) x-squared
(if (pos? y)
(+ x-squared y)
(- x-squared y))))
In essence, I've started replacing single binding lets with as->. John
Hume has pointed out that as-> seems to have been introduced to work
in conjunction with ->. Which brings me to my question - do you think
it's better to use a single binding let from a readability
perspective? Are there any (performance or otherwise) impacts that I
should be aware of?
Cheers, Jay
I prefer the standard `let` in these cases for readability since `as->`,
to me, implies some threading is going on. I only use `as->` when I'm
already using `->` as it saves me an extra binding that breaks up the
flow of the code. WRT performance, the only difference with the `as->`
version is an extra rebinding of `x-squared` as this expansion shows:
(clojure.core/let [x-squared (* x x)
x-squared (if (pos? y)
(+ x-squared y)
(- x-squared y))]
x-squared)
-Ben
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