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-rw-r--r--ruby.html.markdown25
1 files changed, 24 insertions, 1 deletions
diff --git a/ruby.html.markdown b/ruby.html.markdown
index 7bd28d86..fe142365 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -106,8 +106,14 @@ placeholder = 'use string interpolation'
'hello ' + 3 #=> TypeError: can't convert Fixnum into String
'hello ' + 3.to_s #=> "hello 3"
-# print to the output
+# print to the output with a newline at the end
puts "I'm printing!"
+#=> I'm printing!
+#=> nil
+
+# print to the output without a newline
+print "I'm printing!"
+#=> I'm printing! => nill
# Variables
x = 25 #=> 25
@@ -168,6 +174,10 @@ array[-1] #=> 5
# With a start index and length
array[2, 3] #=> [3, 4, 5]
+# Reverse an Array
+a=[1,2,3]
+a.reverse! #=> [3,2,1]
+
# Or with a range
array[1..3] #=> [2, 3, 4]
@@ -265,6 +275,19 @@ end
#=> iteration 4
#=> iteration 5
+# There are a bunch of other helpful looping functions in Ruby,
+# for example "map", "reduce", "inject", the list goes on. Map,
+# for instance, takes the array it's looping over, does something
+# to it as defined in your block, and returns an entirely new array.
+array = [1,2,3,4,5]
+doubled = array.map do |element|
+ element * 2
+end
+puts doubled
+#=> [2,4,6,8,10]
+puts array
+#=> [1,2,3,4,5]
+
grade = 'B'
case grade