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LINQ in Ruby
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class Query | |
undef select | |
def method_missing(id, &block) | |
if block | |
instance_variable_set("@#{id}", block) | |
else | |
instance_variable_get("@#{id}") | |
end | |
end | |
end | |
def from(enum, &block) | |
query = Query.new | |
query.instance_eval(&block) | |
result = enum. | |
select { |i| i.instance_eval(&query.where) }. | |
sort_by { |i| i.instance_eval(&query.order) }. | |
map { |i| i.instance_eval(&query.select) } | |
end | |
names = ["Alf", "Peter", "Heinz", "Udo"] | |
p(from(names) do | |
where { length == 5 } | |
order { downcase } | |
select { upcase } | |
end) |
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