Difference between revisions of "Programming in D for Ruby Programmers"

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(Created page with "This page is under community development. In the meantime, you may find the following links of interest as a Ruby programmer: *[http://hawkins.io/2015/04/excited-about-d/ Ru...")
 
 
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*[https://rounin.livejournal.com/24639.html David Oftedal writes on Project Euler problem 61: from Ruby to D]
 
*[https://rounin.livejournal.com/24639.html David Oftedal writes on Project Euler problem 61: from Ruby to D]
 
*[https://www.google.de/search?q=ruby&domains=dlang.org&sourceid=google-search&sitesearch=forum.dlang.org&gws_rd=cr&ei=fT0kVdbAD8H6sAHFrYDwBQ#q=ruby+site:forum.dlang.org&domains=dlang.org&start=10 forum posts on Ruby]
 
*[https://www.google.de/search?q=ruby&domains=dlang.org&sourceid=google-search&sitesearch=forum.dlang.org&gws_rd=cr&ei=fT0kVdbAD8H6sAHFrYDwBQ#q=ruby+site:forum.dlang.org&domains=dlang.org&start=10 forum posts on Ruby]
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*[https://wiki.dlang.org/Call_D_from_Ruby_using_FFI Call D Functions Using Ruby FFI]
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 +
== Adding methods to existing classes / UFCS ==
 +
 +
In Ruby, it's possible to add methods to existing classes, even builtin ones:
 +
 +
<source lang="ruby">
 +
class String
 +
    def underline
 +
        puts self
 +
        puts "=" * self.length
 +
    end
 +
end
 +
 +
"Hello, world!".underline
 +
 +
# prints:
 +
# Hello, world!
 +
# =============
 +
</source>
 +
 +
Because it uses a static compilation model, it's not possible to do exactly the same in D. However, D allows calling a free function as if it were a method, which mostly has the same effect from a caller's point of view, and has the additional advantage of not polluting the type's namespace:
 +
 +
<source lang="D">
 +
void underline(string s) {
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    import std.stdio : writeln;
 +
    import std.range : repeat;
 +
    writeln(s);
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    writeln('='.repeat(s.length));
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}
 +
 +
void main() {
 +
    "Hello, world!".underline();
 +
}
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</source>
 +
 +
[[Category:Languages versus D]]

Latest revision as of 23:34, 4 August 2016

This page is under community development.

In the meantime, you may find the following links of interest as a Ruby programmer:

Adding methods to existing classes / UFCS

In Ruby, it's possible to add methods to existing classes, even builtin ones:

class String
    def underline
        puts self
        puts "=" * self.length
    end
end

"Hello, world!".underline

# prints:
# Hello, world!
# =============

Because it uses a static compilation model, it's not possible to do exactly the same in D. However, D allows calling a free function as if it were a method, which mostly has the same effect from a caller's point of view, and has the additional advantage of not polluting the type's namespace:

void underline(string s) {
    import std.stdio : writeln;
    import std.range : repeat;
    writeln(s);
    writeln('='.repeat(s.length));
}
 
void main() {
    "Hello, world!".underline();
}