<div dir="ltr"><div>As you dig deeper into Haskell you'll eventually need to understand what these mean to reason about anything beyond first order code.</div><div><br></div><div>The primitives that GHC uses to implement arrays, references and the like live in #. We then wrap them in something in * before exposing them to the user, but you can shave a level of indirection by knowing what lives in # and what doesn't.</div><div><br></div><div>But even if you never care about #, Int, Double, etc. are of kind *, Functors are of kind * -> *, etc. so to talk about the type of types at all you need to be able to talk about these concepts at all with any rigor, and to understand why Maybe Maybe isn't a thing.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 6, 2016 at 8:15 AM, Imants Cekusins <span dir="ltr"><<a href="mailto:imantc@gmail.com" target="_blank">imantc@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thank you Takenobu<br>
<br>
the links are useful, yes.<br>
<br>
Is knowledge of these terms necessary to program or are these terms of<br>
most interest to compiler developers?<br>
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