Ravi Wu raviwu

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This kind of mindset is crucial to managing your career, because when you start to think of yourself as a business, you start to make good business decisions.

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Every step you take without a clear direction is a wasted step. Don’t randomly walk through life without a purpose for your career.

Your big goal should be something not too specific, but clear enough that you can know if you’re steering toward it or not. Think about what you want to ultimately do with your career.

Chapter 2 - Pattern Matching

Simple Match operator `=`

In Elixir, the equals sign = is not an assignment, instead i's like an assertion. It succeeds if Elixir can find a way of making the left-hand side equal the right-hand side. Elixir calls = a match operator.

a = 1
=> 1

	# app/models/user.rb
	class User < ActiveRecord::Base
	has_secure_password

	validates :firstname, presence: true, length: 4..20
	validates :middlename, length: 4..20, allow_blank: true
	validates :lastname, presence: true, length: 4..20
	validates :email, format: { with: /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i }
	validates :password, presence: true, confirmation: true, length: { minimum: 8 }

	# URL with http:// or https://
	%r{\A(http\|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)\.[a-z]{2,5}(([0-9]{1,5})?\/.)?\z}ix

	# email
	/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i

	FROM centos:7

	RUN yum -y update && yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel epel-release libffi-devel gcc-c++ make openssl-devel git sudo

	ENV JAVA_HOME /etc/alternatives/jre

	# Add entrypoint script
	ADD scripts/entrypoint.sh /usr/local/bin/entrypoint.sh
	RUN chmod +x /usr/local/bin/entrypoint.sh
	ENTRYPOINT ["entrypoint.sh"]

Ravi Wu raviwu

Chapter 2 - Pattern Matching

Simple Match operator =

Simple Match operator `=`