Comments on: The Functional Subset of D http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/ Hans-Eric Grönlund on software development Thu, 20 Nov 2008 13:24:23 +0000 http://wordpress.org/?v=2.5.1 By: Functional D: Is Transitive Const Fundamental? http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-13175 Functional D: Is Transitive Const Fundamental? Wed, 30 Jul 2008 11:51:01 +0000 http://www.hans-eric.com/?p=117#comment-13175 [...] I’ve mentioned before, a pure functional subset is forming in the D Programming Language. According to the creators of D, [...] [...] I’ve mentioned before, a pure functional subset is forming in the D Programming Language. According to the creators of D, [...]

]]> By: Reflective Perspective - Chris Alcock » The Morning Brew #99 http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-8044 Reflective Perspective - Chris Alcock » The Morning Brew #99 Thu, 22 May 2008 07:19:19 +0000 http://www.hans-eric.com/?p=117#comment-8044 [...] The Functional Subset of D - Hans-Eric Grönlund looks at functional programming in the D programming language. I’m getting quite interested in functional programming of late, and I always like to see the same concepts in other languages. [...] [...] The Functional Subset of D - Hans-Eric Grönlund looks at functional programming in the D programming language. I’m getting quite interested in functional programming of late, and I always like to see the same concepts in other languages. [...]

]]> By: Hans-Eric http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7933 Hans-Eric Tue, 20 May 2008 19:36:25 +0000 http://www.hans-eric.com/?p=117#comment-7933 So true, I really should rewrite that part. Thank you for pointing it out. So true, I really should rewrite that part. Thank you for pointing it out.

]]> By: Marsh Ray http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7932 Marsh Ray Tue, 20 May 2008 19:13:16 +0000 http://www.hans-eric.com/?p=117#comment-7932 <blockquote>Since data must never change in a functional program it can not be deleted either.</blockquote> Hmmm, I'm not sure that follows. Data can be proven to never be needed again, I guess you could call that "garbage". It can also be recalculated as needed.

Since data must never change in a functional program it can not be deleted either.

Hmmm, I’m not sure that follows. Data can be proven to never be needed again, I guess you could call that “garbage”. It can also be recalculated as needed.

]]> By: Hans-Eric http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7924 Hans-Eric Tue, 20 May 2008 17:10:58 +0000 http://www.hans-eric.com/?p=117#comment-7924 I see your point, but I'm not confusing immutable data with pure functions. I expressed myself rather sloppy though. What I meant to say was that if <em>all data</em> in your program is immutable, some great advantages come. I didn't particularly mean arguments, but rather all data that the function utilizes. In a language where all data is immutable, there is no concept of "pure" functions, since they all are. So in that sense, immutable data and pure functions are related. I see your point, but I’m not confusing immutable data with pure functions. I expressed myself rather sloppy though. What I meant to say was that if all data in your program is immutable, some great advantages come. I didn’t particularly mean arguments, but rather all data that the function utilizes.
In a language where all data is immutable, there is no concept of “pure” functions, since they all are. So in that sense, immutable data and pure functions are related.

]]> By: Hans-Eric http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7922 Hans-Eric Tue, 20 May 2008 17:00:12 +0000 http://www.hans-eric.com/?p=117#comment-7922 Good point! D handles this case too, but not all the way. This is a topic I'm planning to delve into soon, in a different post. Good point! D handles this case too, but not all the way. This is a topic I’m planning to delve into soon, in a different post.

]]> By: Brian http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7916 Brian Tue, 20 May 2008 15:54:04 +0000 http://www.hans-eric.com/?p=117#comment-7916 <blockquote>The side-effect free nature that comes with immutable data has some great advantages. For one thing it simplifies testing since the result of a function only depends on its input</blockquote> You are confusing immutable data with pure functions, they are not related. Just because your function arguments are immutable doesn't mean that a function only depends on its input.

The side-effect free nature that comes with immutable data has some great advantages. For one thing it simplifies testing since the result of a function only depends on its input

You are confusing immutable data with pure functions, they are not related. Just because your function arguments are immutable doesn’t mean that a function only depends on its input.

]]> By: Alek http://www.hans-eric.com/2008/05/20/the-functional-subset-of-d/#comment-7911 Alek Tue, 20 May 2008 14:05:34 +0000 http://www.hans-eric.com/?p=117#comment-7911 To guarantee immutability, shouldn't b = a be denied as well? Otherwise I could do b = a; b.p = null? To guarantee immutability, shouldn’t b = a be denied as well? Otherwise I could do b = a; b.p = null?

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