kevin-lee

Drawing X shape in 2D collection

Common Error Type

case class Error(message: String)

kevin-lee

fib 0 = 0
fib 1 = 1
fib 2 = 1
fib n = fib (n - 1) + fib (n - 2)
-- Get the 100th number 
fib 100
-- But it takes too long.
-- You can do it with zipWith like the following line and it works much faster
fibs = 0 : 1 : 1 : zipWith (+) (drop 1 fibs) (drop 2 fibs)

kevin-lee

How to Use

# Move the the folder where the fonts are available. This script supports only otf and ttf.
# Then simply run the script like
$ ./path/to/script/install-fonts.sh 

Or you can add an alias to the ~/.bashrc or ~/.zshrc

alias install-fonts='/path/to/script/install-fonts.sh' 

kevin-lee

JProfiler with Docker

Docker

DockerFile

DockerFile should have JProfiler installation.

RUN wget <JProfiler file location> -P /tmp/ && \
  tar -xzf /tmp/<JProfiler file> -C /usr/local && \
  rm /tmp/<JProfiler file>

kevin-lee

/**
  * @author Kevin Lee
  * @since 2016-04-09
  */
object StringInterpolation extends App {
  implicit class EscapeNewLineAndDoubleQuote(val sc: StringContext) extends AnyVal {
    def esc(args: Any*): String = {

      val strings = sc.parts.iterator
      val expression = args.iterator

kevin-lee

Static HTML Page Generators

• Hexo: https://hexo.io/
• HubPress: https://github.com/HubPress/hubpress.io (Demo - https://www.youtube.com/watch?v=7gP3i4tHlRM)
• Hugo: https://gohugo.io/
• Jekyll: https://jekyllrb.com/
• Lektor: https://www.getlektor.com/
• Octopress: http://octopress.org/

kevin-lee

let primes :: [Integer]
    primes = sieve [2..]
        where sieve :: [Integer] -> [Integer]
              sieve (x : xs) = x : sieve [n | n <- xs, n `mod` x /= 0]

-- It works even without parameter types specified yet it is always good to have the type information
-- as it tells the users of the function how to use it.
-- It can also help you implement the function.

-- primes without parameter types (Uncomment it if you want to try).

kevin-lee

/**
  * @author Kevin Lee
  * @since 2016-01-15
  */
object WordCount extends App {
  def wordCount(lines: String): Map[String, Array[Int]] =
    lines.split('\n')
      .map(_.trim)
      .map(_.split("[\\s]+"))
      .zipWithIndex

kevin-lee

How to Run

$ scala TakeLinks.scala 

Result

old version
======================
Test URL1

kevin-lee

package cc.kevinlee.examples;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;

import static cc.kevinlee.examples.KeyValPair.*;

/**