daiando’s gists

daiando / recursive_tree.sh

Last active November 23, 2015 01:06

Recursive tree memo

	#!/bin/bash
	read N
	if [ ${N} -gt 5 -o ${N} -lt 1 ]; then
	echo "input number must be =< 5 & => 1"
	fi
	###design
	## vertical
	for((countY=0;countY<${N};countY++)); do
	USE_VERTICAL=$((${USE_VERTICAL} + 2 * $((16 / 2 ** ${countY}))))
	done

daiando / use_enumerable_map.rb

Last active December 1, 2015 00:07

Ruby>enumerable>map>sample001

	#You have been provided with a custom object called colors that defines it's own each method.
	#You need to iterate over the items and return an Array containing the values.
	def iterate_colors(colors)
	colors.map{\|value\| value}
	end

daiando / each_with_index_array_sample001.rb

Last active December 3, 2015 01:47

[ ruby ] each_with_index のサンプル ref: http://qiita.com/penguin_dream/items/81dedfb4aed6a4d847c4

	array = []
	sample = %w(a b c d e)
	sample.each_with_index { \|item, index\| array[index] = "#{index}:#{item}" }
	p array
	=> ["0:a","1:b","2:c","3:d","4:e"]

daiando / enumerable_map_rot13.rb

Last active December 7, 2015 01:13

write a method which takes an array of strings (containing secret enemy message bits!) and decodes its elements using ROT13 cipher system; returning an array containing the final messages.

	def rot13(secret_messages)
	secret_messages.map { \|x\|
	x.tr!("A-Za-z", "N-ZA-Mn-za-m")
	}
	end

daiando / enumerable_reduce_sample01.rb

Created December 7, 2015 01:13

Consider and arithmetico-geometric sequence where the nth term of the sequence is denoted by t(n)=n**2+1,n>0. In this challenge, your task is to complete the sum method which takes an integer n and returns the sum to the n terms of the series.

	def sum_terms(n)
	(1..n).reduce(0){\|sum, i\| sum + i**2 + 1}
	end

daiando / enumerable_other_sample001.rb

Created December 8, 2015 01:03

ruby>enumerator>any, all, none, find

	def func_any(hash)
	# Check and return if any key object within the hash is of the type Integer
	hash.any? {\|key, value\| key.is_a? Integer}
	end

	def func_all(hash)
	# Check and return if all the values within the hash are Integers and are < 10
	hash.all? {\|key, value\| value < 10}
	end

daiando / enumerable_groupby_sample01.rb

Last active December 10, 2015 08:58

[ ruby ] group_byを使う ref: http://qiita.com/penguin_dream/items/179460ee63f7ca26a988

	def evaluate_num(val)
	return "RED" if val <= 2
	return "BLUE" if val > 3
	end
	(1..5).group_by {\|x\|
	evaluate_num(x)
	}
	#=> {"RED"=>[1, 2], "BLUE"=>[3, 4, 5]}

	#marks = {"Ramesh":23, "Vivek":40, "Harsh":88, "Mohammad":60}

daiando / handle_many_arguments_sample01.rb

Last active December 14, 2015 02:10

	def full_name(first, *rest)
	array = []
	rest.map{\|x\| array << x }
	array2 = []
	return error if first == nil
	array2 << first
	array2.concat(array).join(" ")
	end
	### array "names" includes all arguments
	def full_name(*names)