Last Saturday I was on Coderetreat 2013 in Vienna. There we tried to implement rules of Conway's Game of Life. During the day I've got a lot of experience in TDD, pair programming and languages I haven't used for a while. One thing I've missed was final implementation of game.
Last weekend I spent some time running my Scala/Play application on Raspberry PI. I got an OutOfMemoryError and had to slightly extend swap space:
>sudo su
>echo "CONF_SWAPSIZE=512" > /etc/dphys-swapfile
>dphys-swapfile setup
>dphys-swapfile swapon
Variable arguments listMost of the time, you will define your methods in the main body of the class definition. This is the easiest and most logical place. However, there are a few occasions when you may wish to attach a method to an object prototype from somewhere else in the code. This may be for stylistic or metaprogramming reasons, or most likely, to attach methods to an object that you did not define. CoffeeScript provides the :: operator for easy access to an object's prototype.
Appending ... to an argument name in the function definition tells CoffeeScript to accept any number of arguments. That variable will be assigned an array containing all the relevant values that were passed.Check on existence
CoffeeScript has a helpful existential operator to deal with these situations correctly and cleanly. It is a simple ? symbol.Destructuring assignments
We can even use destructuring assignment to perform in-place variable swaps:Loops return array of results
[first, second] = ["cow", "milk"]
# Wait, or is it the other way around?
[first, second] = [second, first]
console.log "Don't put the #{second} before the #{first}."
Destructuring assignment can be used with more complicated structures too:
[drink, [alcohol, mixer]] = ["Screwdriver", ["vodka", "orange juice"]]
console.log "A #{drink} consists of #{alcohol} and #{mixer}."
One extremely useful feature of CoffeeScript loops is that they return a value—an array of the results of the inner statement for every item in the loop. If you've ever used Array.prototype.map to transform an array, you'll be happy to see that it's easy to achieve the same functionality in CoffeeScript.Link on book in store
CoffeeScript Application Development, the book I read lately, helped me to take overall look at the language I have recently used on a number of projects. Like many books about programming languages it is also divided into chapters which follow you from the very beginning — tools installation and basic syntax to more advanced topics like classes and asynchronous operations. The book also covers such things as debugging, using the language for server-side development and adopting it for usage with different JS-frameworks.
nginx -V
--with-http_realip_module
set_real_ip_from 111.111.111.111;
real_ip_header X-Real-IP;
real_ip_recursive on;
<Valve
className="org.apache.catalina.valves.RemoteIpValve"
internalProxies="111\.111\.111\.111"
remoteIpHeader="x-forwarded-for"
remoteIpProxiesHeader="x-forwarded-by"
protocolHeader="x-forwarded-proto"
/>
App.DatePickerView = Ember.TextField.extend
_valueChanged: Em.observer 'value', ->
value = moment(@get('value'), 'DD.MM.YYYY HH:mm')
@$().data("DateTimePicker").setDate(value)
return
didInsertElement: ->
@$().datetimepicker
format: 'DD.MM.YYYY HH:mm'
return
{{view App.DateField value=mydate}}
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
Long id;
@OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
List<Account> accounts;
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
">
<!-- ... -->
<tx:annotation-driven/>
<!-- ... -->
</beans>