I solved the Gigasecond exercise in Ruby a month ago but I forgot to post it.
Since my previous post was about the solution to this exercise using Clojure, I'll post here its solution in Ruby:
In this case life is much easier in Ruby :)
Sunday, August 3, 2014
Exercism: "Gigasecond in Clojure"
This is my solution to the Gigasecond problem in Clojure.
To solve it I had to learn first how to add days to a date in Java by having a look to the SimpleDateFormat and Calendar classes.
Then I learned a bit about how to use Java from Clojure in the Clojure Java Interop documentation and this other useful post: Calling java from Clojure.
Finally, once I had it working on the REPL, I added some private helper functions and used the -> macro in the implementation of the from function to make the code more readable.
You can nitpick my solution here or see all the exercises I've done so far in this repository.
To solve it I had to learn first how to add days to a date in Java by having a look to the SimpleDateFormat and Calendar classes.
Then I learned a bit about how to use Java from Clojure in the Clojure Java Interop documentation and this other useful post: Calling java from Clojure.
Finally, once I had it working on the REPL, I added some private helper functions and used the -> macro in the implementation of the from function to make the code more readable.
You can nitpick my solution here or see all the exercises I've done so far in this repository.
Interesting Talk: "Becoming an Outlier: Career Reboot for the Developer Mind"
I've just watched this interesting talk by Cory House:
Using jQuery Validation plugin with a custom rule and HTML5 data attributes
This is a small example from something I did recently at work.
We needed to apply some custom validation rules to some form fields using the jQuery Validation Plugin.
The decision of which fields were contained in a given form was taken dynamically, so instead of dynamically creating a rules object to pass it to the validate method, we decided to use HTML5 data attributes.
In the following example, I'll show you a way to do it.
Imagine that we'd like to validate that the first name introduced in a form is a palindrome.
To do it you could add a custom rule palindrome to the jQuery Validation plugin using its addMethod method and then validate the form, as shown in this JavaScript code:
In the form we can refer to this custom rule using HTML5 data attributes:
We used data-rule-palindrome="true" to state that the fname field must contain a palindrome and data-msg-palindrome="Please your name must be a palindrome" to set the message that is shown in case it's not a palindrome.
In a nutshell, using jQuery Validation plugin with a custom rule and HTML5 data attributes is as easy as adding a custom rule with addMethod and then adding in the field you want to validate with the custom rule:
I hope you might find this useful
We needed to apply some custom validation rules to some form fields using the jQuery Validation Plugin.
The decision of which fields were contained in a given form was taken dynamically, so instead of dynamically creating a rules object to pass it to the validate method, we decided to use HTML5 data attributes.
In the following example, I'll show you a way to do it.
Imagine that we'd like to validate that the first name introduced in a form is a palindrome.
To do it you could add a custom rule palindrome to the jQuery Validation plugin using its addMethod method and then validate the form, as shown in this JavaScript code:
In the form we can refer to this custom rule using HTML5 data attributes:
We used data-rule-palindrome="true" to state that the fname field must contain a palindrome and data-msg-palindrome="Please your name must be a palindrome" to set the message that is shown in case it's not a palindrome.
In a nutshell, using jQuery Validation plugin with a custom rule and HTML5 data attributes is as easy as adding a custom rule with addMethod and then adding in the field you want to validate with the custom rule:
- data-rule + custom_rule_name="true" to apply the rule to a given field
- data-msg- + custom_rule_name = "message" to set the error message
I hope you might find this useful
Saturday, August 2, 2014
Exercism: Revisiting "Grains in Clojure"
Recently I solved the Grains problem using a home-made stream both using Clojure and Racket (check the the Clojure's solution and the Racket's solution).
As I said then, the solution in Clojure was not idiomatic at all. I just wanted to write a stream in Clojure similar to the ones I had studied in the Coursera Programming Languages course.
This new version is a much more simple and Clojurist way of solving the same problem using the iterate function:
The iterate function generates a lazy sequence containing the number of grains in each square. The square and total functions realize that lazy sequence to get the content of a given square and the sum of the 64 squares of the chess board, respectively.
You can nitpick my solution here or see all the exercises I've done so far in this repository.
As I said then, the solution in Clojure was not idiomatic at all. I just wanted to write a stream in Clojure similar to the ones I had studied in the Coursera Programming Languages course.
This new version is a much more simple and Clojurist way of solving the same problem using the iterate function:
The iterate function generates a lazy sequence containing the number of grains in each square. The square and total functions realize that lazy sequence to get the content of a given square and the sum of the 64 squares of the chess board, respectively.
You can nitpick my solution here or see all the exercises I've done so far in this repository.
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