diff options
Diffstat (limited to 'ruby.html.markdown')
| -rw-r--r-- | ruby.html.markdown | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/ruby.html.markdown b/ruby.html.markdown index 792c9c95..8f23b2e6 100644 --- a/ruby.html.markdown +++ b/ruby.html.markdown @@ -79,10 +79,14 @@ true && false #=> false true || false #=> true !true #=> false -# Alternate spellings of logical operators -true and false #=> false -true or false #=> true -not true #=> false +# There are alternate versions of the logical operators with much lower +# precedence. These are meant to be used as flow-control constructs to chain +# statements together until one of them returns true or false. + +# `do_something_else` only called if `do_something` succeeds. +do_something() and do_something_else() +# `log_error` only called if `do_something` fails. +do_something() or log_error() # Strings are objects @@ -164,11 +168,17 @@ 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] # Add to an array like this array << 6 #=> [1, 2, 3, 4, 5, 6] +# Or like this +array.push(6) #=> [1, 2, 3, 4, 5, 6] # Check if an item exists in an array array.include?(1) #=> true |