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Let's say I have a function foo: def foo(A, B, C) A + B + C end And I call it like this, with only the last parameter changing: foo("foo", "bar", "123") foo("foo&...

I have a text file, that need to be split in the following way: first line is an identifier and must be at the top of every file created, following lines are a pair of digits separated by a comma: ...

I am processing 2-dimensional shapes in ruby. I have a Point class with x and y attribute, and a Line class which has two end points. Later in the process chain, I often want to identify and process ...

I redefined function fold using reduce method in Ruby. def fold(f, init, lst) lst.reduce(init){|w, a| f.call(w, a)} end I have reverse and twist functions below and examples on how they should ...

I have an array I want to turn into a hash map keyed by the item and with an array of indices as the value. For example arr = ["a", "b", "c", "a"] would ...

I have 3 array of hashes: a = [{name: 'Identifier', value: 500}, {name: 'Identifier2', value: 50 }] b = [{name: 'Identifier', value: 500}, {name: 'Identifier2', value: 50 }] c = [{name: 'Identifier', ...

Apparently, my ability to think functional withered over time. I have problems to select a sub-dataset from a dataset. I can solve the problem the hacky imperative style, but I believe, there is a ...

I have a string that looks like this: "[hello][my][friend]" I'm interested in returning an array like ["hello", "my", "friend"] How can I do this in Ruby?