Java is from Mars, Ruby is from Venus

Java is from Mars,Ruby is from Venus @nusco (paolo perrotta)

why Ruby

expressive

fast feedback

great community

why Java

powerful tools

automated refactoring

rock-solid

learn both

difficult

- tools__- values_- design_

learning a library

the static workflow 1. open the IDE 2. set up a project 3. read the docs 4. write/run code 5. repeat from 3...

the dynamic workflow 1. open the interpreter 2. import the library 3. introspect the library 4. try code 5. repeat from 3...

the command line

functional fixedness “A mental block against usingan object in a new way that is required to solve a problem.”

the dynamic workflow 1. open the interpreter 2. import the library 3. introspect the library 4. try code 6. repeat from 3...

the dynamic workflow 1. open the interpreter 2. import the library 3. introspect the library 4. try code 5. read the source 6. repeat from 3...

values

“do it right” vs.“keep it simple”

ethnocentrism“The viewpoint that one’s own group is the center ofeverything, against which all other groups are judged.”

design

bumblebees

good design in Java

small interfaces

many small classes

limited inheritance

few class methods

ActiveRecord

require active_recordclass User < ActiveRecord::Baseenduser = User.find(:first)user.name = "Nusco"user.save

require active_recordActiveRecord::Base.ancestors.count # => 42ActiveRecord::Base.instance_methods.count # => 240ActiveRecord::Base.methods.count # => 508

modules

small interfaces small classeslimited inheritance few class methods

readability “once and only once” decouplingshared responsibilities

the Saphir-Worf hyphotesis“Our language influences our way of thinking.”

- functional fixedness______- ethnocentrism_____________- the Sapir–Whorf hypothesis

learning a new language

1. be aware

2. get uncomfortable

3. think generalist

1. be aware__________2. get uncomfortable_3. think generalist__

thank you.

Google: metaprogramming perrotta

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Java is from Mars, Ruby is from Venus

by paoloperrotta

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