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techcon2015.html
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<!DOCTYPE html>
<html>
<head>
<title>TechCon 2015 Ruby Language</title>
<meta charset="utf-8">
<style>
@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
@import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700,400italic);
body { font-family: 'Droid Serif'; }
h1, h2, h3 {
font-family: 'Yanone Kaffeesatz';
font-weight: normal;
}
.remark-code, .remark-inline-code { font-family: 'Ubuntu Mono'; }
</style>
</head>
<body>
<textarea id="source">
class: center, middle
# TechCon 2015
###Ruby Language
*Not boring as you thought*
---
class: center, middle
# $whoami
###An LP Nguyen
####SSE R&D
---
class: center, middle
## I'm not going to introduce Ruby
I'm going to introduce a fun, crazy and weird language
---
# Let's play a game
- Easy
- Normal
- *Hard*
- *Insane*
---
# Basic Knowledge
array
```ruby
a = [1,2,3,4,5]
```
hash
```ruby
h = {key: "value", another_key:"another value"}
h = {:key => "value", :another_key => "another value"}
h = {"key" => "value", "another_key" => "another value"}
```
method
```ruby
object.method
object.method(variable)
```
---
# Easy level
A given array
```ruby
a = [1,2,3,4,5]
```
--
Get first element in an array
--
```ruby
a[0]
```
--
Get last element in an array
--
```ruby
a[a.count - 1]
```
--
Ruby way :)
```ruby
a.first
a.last
```
---
# Normal level
```ruby
if a == nil
a = 2
Or:
a = 2 if a == nil
Or:
a = a == nil ? 2 : a
```
--
Ruby way
```ruby
a ||= 2
```
--
array operators
```ruby
[1,2] << 3 == [1,2,3]
[1,2] + [3,4,5] == [1,2,3,4,5]
[1,2] << [3,4,5] == [1,2,[3,4,5]]
```
---
# Normal level
Parallel assignment
```ruby
a = [1,2,3,4,5]
c,d = a
Result:
c = 1
d = 2
```
--
Is the following correct?
```ruby
a, = [1,2,3]
```
--
```ruby
a,b,(c,) = [1,2,[3,4,5]]
```
*crazy but still work!*
---
# Hard level
Array methods
```ruby
[1,2,[3,4,5]].flatten
Result: [1,2,3,4,5]
[1,2,3,4].map {|a| a+1}
Result: [2, 3, 4, 5]
[1,2,3,4].inject { |result, element| result + element }
Result: 10
```
--
Guess the code to sort this array?
```ruby
a = [4,2,1,6,7]
```
--
```ruby
a = [4,2,1,6,7]
a.sort
```
---
# Hard level
A gift for who can explain the below code
```ruby
class Subclass < [Array, Hash, String, Fixnum, Float, TrueClass].sample
end
Subclass.superclass
```
---
# Insane level
Monkey-patch
```ruby
1.k
NoMethodError: undefined method `k' for 1:Fixnum
```
--
```ruby
class Fixnum
def k
self * 1000
end
end
```
--
```ruby
> 1.k
=> 1000
```
--
usage
```ruby
1.days.ago
10.minutes
```
--
> monkey-patching is not considered a good practice
---
# Insane level
Another gift
```ruby
result, = [[2,3],4,6]
result.map {|x| x * x}
```
---
class: center, middle
# Summary
---
class: center, middle
# Thank you!
## Any thoughts?
</textarea>
<script src="remark-latest.min.js">
</script>
<script>
var slideshow = remark.create();
</script>
</body>
</html>