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#!/usr/bin/env ruby | |
class MegaGreeter | |
attr_accessor :names | |
def initialize(names = 'World') | |
@names = names | |
end | |
def say_hi | |
if @names.nil? | |
puts '...' | |
elsif @names.respond_to? :each | |
@names.each do |name| | |
puts "hello #{name}" | |
end | |
else | |
puts "hello #{@names}" | |
end | |
end | |
end | |
def fib(n) | |
return 0 if n.zero? | |
return 1 if n < 2 | |
fib(n - 1) + fib(n - 2) | |
end | |
def min_max_sum(arr) | |
[arr.sum - arr.max, arr.sum - arr.min] | |
end | |
def merge_sorted(arr1, arr2) | |
result = [] | |
while !arr1.length.zero? && !arr2.length.zero? | |
if arr1[0] < arr2[0] | |
result.push arr1.shift | |
else | |
result.push arr2.shift | |
end | |
end | |
result.concat arr1, arr2 | |
end | |
def merge_sort(arr) | |
return arr if arr.length < 2 | |
merge_sorted(merge_sort(arr[0, arr.length / 2]), | |
merge_sort(arr.drop(arr.length / 2))) | |
end | |
puts merge_sort([2, 3, 1, 5, 1, 22, 11]) | |
def curry(func, *args) | |
lambda do |*new_args| | |
args = args.concat new_args | |
if args.length == func.arity | |
func.call(*args) | |
else | |
curry func, args | |
end | |
end | |
end | |
def a(b, c) | |
puts b, c | |
end | |
puts curry(method(:a)).call(1).call.call(2) |
I'm concern about mutating args
here https://gist.github.com/scdekov/ccf587f2a5ee2943278818e2e70df51e#file-rb-L57. It may not a problem in this situation but using concat
with some data that have come from outside isn't a good practice(mutation).
You can use modules as containers for functions.
module M
def self.baba
# something
end
end
M.baba
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https://gist.github.com/scdekov/ccf587f2a5ee2943278818e2e70df51e#file-rb-L34 better naming than
arr1
,arr2
. Maybeleft_arr
andright_arr
will be better.