Ruby Data Structures - Revision history

Scott: /* Date and Time */

2015-04-27T23:57:03Z

Date and Time

← Older revision		Revision as of 23:57, 27 April 2015
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	my_time = Time.local(2007, 9, 11, 17, 30, 13) # Tue Sep 11 17:30:13 -0700 2007		my_time = Time.local(2007, 9, 11, 17, 30, 13) # Tue Sep 11 17:30:13 -0700 2007
	another_date = '2011-09-21'.to_date		another_date = '2011-09-21'.to_date
			yet_another = DateTime.strptime('2015-04-27 4:45 PM', '%Y-%m-%d %H:%M %p')
	</source>		</source>

2014-01-17T23:05:51Z

Literals

← Older revision		Revision as of 23:05, 17 January 2014
Line 72:		Line 72:
	letter		letter
	</source>		</source>
			NOTE: if you want to indent the closing "letter", use <code><<-letter</code> to start the here document

	=== Concatenation ===		=== Concatenation ===

2012-03-20T21:49:01Z

Date and Time

← Older revision		Revision as of 21:49, 20 March 2012
Line 298:		Line 298:
	<source lang="ruby">		<source lang="ruby">
	require 'date'		require 'date'
			xmas = Date.parse('12/25/2010') # works for usual formats
	today = Date.today		today = Date.today
	today.to_s # "2007-09-12"		today.to_s # "2007-09-12"

2012-03-20T21:32:12Z

Iterate

← Older revision		Revision as of 21:32, 20 March 2012
Line 181:		Line 181:
	<source lang="ruby">		<source lang="ruby">
	my_array.each do \|e\| { do something with e }		my_array.each do \|e\| { do something with e }
			</source>
			or
			<source lang="ruby">
			for e in my_array
			do something with e
			end
	</source>		</source>

2012-03-20T21:30:50Z

Methods

2011-12-17T00:12:26Z

Date and Time

2011-10-14T18:48:33Z

Parsing Strings to get Numbers

← Older revision		Revision as of 18:48, 14 October 2011
Line 43:		Line 43:
	"2.9979246e5".to_f # 299792.46		"2.9979246e5".to_f # 299792.46
	Float("6.02e23") # 6.02e23		Float("6.02e23") # 6.02e23
			</source>

			=== Formatting Numbers ===
			<source lang="ruby">
			x = 345.6789
			printf("x = %6.2f\n", x) # x = 345.68, prints immediately
			sprintf("x = %6.2f\n", x) # returns a String
			"x = %6.2f\n" % x # same thing
	</source>		</source>

2011-10-14T18:18:56Z

Numbers

2011-10-14T18:13:41Z

Numbers

← Older revision		Revision as of 18:13, 14 October 2011
Line 5:		Line 5:
	2e-20 # Float		2e-20 # Float
	?a # character code for 'a', which is 97		?a # character code for 'a', which is 97
			1_048_576 # same as 1048576
			Float::MIN # 2.2250738585072e-308 (on this machine)
			Float::MAX # 1.79769313486232e+308
			Float::EPSILON # 2.22044604925031e-16
	</source>		</source>

2011-10-14T18:02:35Z

MD5 hash

← Older revision		Revision as of 18:02, 14 October 2011
Line 131:		Line 131:
	require 'md5' # already included in Rails		require 'md5' # already included in Rails
	secret = Digest::MD5.hexdigest(password)		secret = Digest::MD5.hexdigest(password)
			</source>

			=== Encoding and Decoding base64 Strings ===
			<source lang="ruby">
			x = "abcdefg"
			[x].pack("m") # "YWJjZGVmZw==\n"
			[x].pack("m").unpack("m") # ["abcdefg"]
	</source>		</source>