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Ruby

Golfing basics with Ruby
Ruby Golfing

Golfing basics with Ruby

Want to start golfing ?

Sébastien Faure
Sébastien Faure
Goruby
Ruby

Goruby

Shorter Ruby!

Alexandre Borderes
Alexandre Borderes
casecmp
Ruby

casecmp

Case insensitive comparison

Alexandre Borderes
Alexandre Borderes
||= vs defined?
Ruby

||= vs defined?

Cache false/nil

Alexandre Borderes
Alexandre Borderes
Local variable
Ruby

Local variable

A detail on how they work

Alexandre Borderes
Alexandre Borderes
tap 👏
Ruby

tap 👏

For method chaining

Alexandre Borderes
Alexandre Borderes
**{double splat operator}
Ruby

**{double splat operator}

The double splat operator for Hash

Alexandre Borderes
Alexandre Borderes
benchmark
Ruby

benchmark

Need to speed up?

Alexandre Borderes
Alexandre Borderes
rescue ... else
Ruby

rescue ... else

A case to handle if there are no exceptions?

Alexandre Borderes
Alexandre Borderes
flat_map vs flatten
Ruby

flat_map vs flatten

Flatten your arrays!

Alexandre Borderes
Alexandre Borderes
to_h
Ruby

to_h

Convert to Hash

Alexandre Borderes
Alexandre Borderes
super
Ruby

super

Handle arguments

Alexandre Borderes
Alexandre Borderes
Endless method
Ruby

Endless method

Methods without "end"

Alexandre Borderes
Alexandre Borderes
String#delete
Ruby

String#delete

Delete characters

Alexandre Borderes
Alexandre Borderes
group_by
Ruby

group_by

Classify your data

Alexandre Borderes
Alexandre Borderes
Array #+ vs #- vs #| vs #&
Ruby

Array #+ vs #- vs #| vs #&

Merge arrays

Alexandre Borderes
Alexandre Borderes
for loop
Ruby

for loop

Ruby also has a for loop!

Alexandre Borderes
Alexandre Borderes
fill
Ruby

fill

To fill an array

Alexandre Borderes
Alexandre Borderes
&.
Ruby

&.

Reduce the « 1 billion dollar mistake »!

Alexandre Borderes
Alexandre Borderes
_1, _2, ... it?
Ruby

_1, _2, ... it?

Numbered parameters

Alexandre Borderes
Alexandre Borderes
yield_self / then
Ruby

yield_self / then

For method chaining

Alexandre Borderes
Alexandre Borderes
+"string"
Ruby

+"string"

Mutable string

Alexandre Borderes
Alexandre Borderes
__END__
Ruby

__END__

A little more than a comment

Alexandre Borderes
Alexandre Borderes
IRB assembly
Ruby

IRB assembly

Ruby in your browser

Alexandre Borderes
Alexandre Borderes
except / slice
Ruby

except / slice

Keys to deal with? 🔑

Alexandre Borderes
Alexandre Borderes
Date.parse
Ruby

Date.parse

The default current century 🤯

Alexandre Borderes
Alexandre Borderes
compact
Ruby

compact

Filter nil values

Alexandre Borderes
Alexandre Borderes
lazy
Ruby

lazy

Take a break!

Alexandre Borderes
Alexandre Borderes
do...while
Ruby

do...while

The do...while loop in Ruby exists

Alexandre Borderes
Alexandre Borderes
_
Ruby

_

Underscore

Alexandre Borderes
Alexandre Borderes
Rightward assignment
Ruby

Rightward assignment

The new assignment operator =>

Alexandre Borderes
Alexandre Borderes
tally
Ruby

tally

Count the number of occurrences

Alexandre Borderes
Alexandre Borderes
"a" + "b" << "c#{"d"}"
Ruby

"a" + "b" << "c#{"d"}"

String concatenation

Alexandre Borderes
Alexandre Borderes
== vs === vs eql? vs equal?
Ruby

== vs === vs eql? vs equal?

Why so many methods of comparison?

Alexandre Borderes
Alexandre Borderes
Array and multiplication
Ruby

Array and multiplication

The Array class redefines the `*` operator

Alexandre Borderes
Alexandre Borderes
flip-flop
Ruby

flip-flop

The obscure conditional expression

Alexandre Borderes
Alexandre Borderes
pp
Ruby

pp

For "pretty print"

Alexandre Borderes
Alexandre Borderes
percent literal
Ruby

percent literal

Yes, this piece of code is perfectly correct !

Alexandre Borderes
Alexandre Borderes
cycle 🔄
Ruby

cycle 🔄

You'll go round in circles!

Alexandre Borderes
Alexandre Borderes
nonzero?
Ruby

nonzero?

The opposite of zero?... Well, not exactly!

Alexandre Borderes
Alexandre Borderes
dig ⛏️
Ruby

dig ⛏️

Need a pick?

Alexandre Borderes
Alexandre Borderes
split
Ruby

split

A special case to be aware of

Alexandre Borderes
Alexandre Borderes
clamp
Ruby

clamp

A bounded method!

Alexandre Borderes
Alexandre Borderes
binding.irb
Ruby

binding.irb

IRB for Interactive RuBy

Alexandre Borderes
Alexandre Borderes
none? one? any? all?
Ruby

none? one? any? all?

How they really work

Alexandre Borderes
Alexandre Borderes
command-line
Ruby

command-line

Ruby is also very comfortable in scripting mode. It can replace `sed`, `grep`, `awk`, ...

Alexandre Borderes
Alexandre Borderes
RbConfig
Ruby

RbConfig

A little-documented module

Alexandre Borderes
Alexandre Borderes
grep
Ruby

grep

Yes, we're talking about Ruby, not the command-line utility!

Alexandre Borderes
Alexandre Borderes
minMAX
Ruby

minMAX

We thought we knew them, but we discovered some subtleties!

Alexandre Borderes
Alexandre Borderes
"s l i c e"
Ruby

"s l i c e"

String manipulation in Ruby is very advanced. With the `[]` method or its alias `slice`, it's easy to extract a complex part!

Alexandre Borderes
Alexandre Borderes
*[splat operator]
Ruby

*[splat operator]

The splat operator is a handy way of manipulating arrays and arguments.

Alexandre Borderes
Alexandre Borderes
Float precision
Ruby

Float precision

Float precision is not infinite. Depending on your use case, you need to be very careful.

Alexandre Borderes
Alexandre Borderes
round(half:)
Ruby

round(half:)

Rounding in Ruby doesn't work like it does in Python, but you can customize it to change that behavior

Alexandre Borderes
Alexandre Borderes