A list of code blocks from many languages to, for example, test a custom theme and see how it renders the code for each language.

syntax-highlighting-languages.md

Syntax Highlighting in Markdown

A list of code blocks from many languages to, for example, test a custom theme and see how it renders the code for each language.

Bash

#!/bin/bash

for OPT in "$@"
do
  case "$OPT" in
    '-f' )  canonicalize=1 ;;
    '-n' )  switchlf="-n" ;;
  esac
done

# readlink -f
function __readlink_f {
  target="$1"
  while test -n "$target"; do
    filepath="$target"
    cd `dirname "$filepath"`
    target=`readlink "$filepath"`
  done
  /bin/echo $switchlf `pwd -P`/`basename "$filepath"`
}

if [ ! "$canonicalize" ]; then
  readlink $switchlf "$@"
else
  for file in "$@"
  do
    case "$file" in
      -* )  ;;
      *  )  __readlink_f "$file" ;;
    esac
    done
fi

exit $?

#!/bin/bash

###### CONFIG
ACCEPTED_HOSTS="/root/.hag_accepted.conf"
BE_VERBOSE=false

if [ "$UID" -ne 0 ]
then
 echo "Superuser rights required"
 exit 2
fi

genApacheConf(){
 echo -e "# Host ${HOME_DIR}$1/$2 :"
}

echo '"quoted"' | tr -d \" > text.txt

C

#include <stdio.h>

extern size_t
pb_varint_scan(const uint8_t data[], size_t left) {
  assert(data && left);
  left = left > 10 ? 10 : left;

#ifdef __SSE2__

  /* Mapping: remaining bytes ==> bitmask */
  static const int mask_map[] = {
    0x0000, 0x0001, 0x0003, 0x0007,
    0x000F, 0x001F, 0x003F, 0x007F,
    0x00FF, 0x01FF, 0x03FF
  };

  /* Load buffer into 128-bit integer and create high-bit mask */
  __m128i temp = _mm_loadu_si128((const __m128i *)data);
  __m128i high = _mm_set1_epi8(0x80);

  /* Intersect and extract mask with high-bits set */
  int mask = _mm_movemask_epi8(_mm_and_si128(temp, high));
  mask = (mask & mask_map[left]) ^ mask_map[left];

  /* Count trailing zeroes */
  return mask ? __builtin_ctz(mask) + 1 : 0;

#else

  /* Linear scan */
  size_t size = 0;
  while (data[size++] & 0x80)
    if (!--left)
      return 0;
  return size;

#endif /* __SSE2__ */

}

C++

Extension::
Extension(const Descriptor *descriptor, const Descriptor *scope) :
    descriptor_(descriptor),
    scope_(scope) {

  /* Extract full name for signature */
  variables_["signature"] = descriptor_->full_name();

  /* Prepare message symbol */
  variables_["message"] = StringReplace(
    variables_["signature"], ".", "_", true);
  LowerString(&(variables_["message"]));

  /* Suffix scope to identifiers, if given */
  string suffix ("");
  if (scope_) {
    suffix = scope_->full_name();

    /* Check if the base and extension types are in the same package */
    if (!scope_->file()->package().compare(descriptor_->file()->package()))
      suffix = StripPrefixString(suffix,
        scope_->file()->package() + ".");

    /* Append to signature */
    variables_["signature"] += ".[" + suffix +"]";
    suffix = "_" + suffix;
  }

  /* Prepare extension symbol */
  variables_["extension"] = StringReplace(
    suffix, ".", "_", true);
  LowerString(&(variables_["extension"]));
}

#include <iostream>

int main(int argc, char *argv[]) {

  /* An annoying "Hello World" example */
  for (auto i = 0; i < 0xFFFF; i++)
    cout << "Hello, World!" << endl;

  char c = '\n';
  unordered_map <string, vector<string> > m;
  m["key"] = "\\\\"; // this is an error

  return -2e3 + 12l;
}

C#

public static void Send(
    Socket socket, byte[] buffer, int offset, int size, int timeout) {
  int startTickCount = Environment.TickCount;
  int sent = 0;
  do {
    if (Environment.TickCount > startTickCount + timeout)
      throw new Exception("Timeout.");
    try {
      sent += socket.Send(buffer, offset + sent,
        size - sent, SocketFlags.None);
    } catch (SocketException ex) {
      if (ex.SocketErrorCode == SocketError.WouldBlock ||
          ex.SocketErrorCode == SocketError.IOPending ||
          ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable) {
        /* Socket buffer is probably full, wait and try again */
        Thread.Sleep(30);
      } else {
        throw ex;
      }
    }
  } while (sent < size);
}

CoffeeScript

grade = (student, period=(if b? then 7 else 6)) ->
  if student.excellentWork
    "A+"
  else if student.okayStuff
    if student.triedHard then "B" else "B-"
  else
    "C"

class Animal extends Being
  constructor: (@name) ->

  move: (meters) ->
    alert @name + " moved #{meters}m."

Clojure

(clojure-version)

(defn partition-when
  [f]
  (fn [rf]
    (let [a (java.util.ArrayList.)
          fval (volatile! false)]
      (fn
        ([] (rf))
        ([result]
           (let [result (if (.isEmpty a)
                          result
                          (let [v (vec (.toArray a))]
                            ;; Clear first
                            (.clear a)
                            (unreduced (rf result v))))]
             (rf result)))
        ([result input]
            (if-not (and (f input)  @fval)
               (do
                 (vreset! fval true)
                 (.add a input)
                 result)
               (let [v (vec (.toArray a))]
                 (.clear a)
                 (let [ret (rf result v)]
                   (when-not (reduced? ret)
                     (.add a input))
                   ret))))))))


(into [] (partition-when
          #(.startsWith % ">>"))
          ["1d" "33" ">> 1" ">> 2" "22" ">> 3"])

CSS

@font-face {
  font-family: Chunkfive; src: url('Chunkfive.otf');
}

body, .usertext {
  color: #F0F0F0; background: #600;
  font-family: Chunkfive, sans;
  --heading-1: 30px/32px Helvetica, sans-serif;
}

@import url(print.css);
@media print {
  a[href^=http]::after {
    content: attr(href)
  }
}

Diff

Index: grunt.js
===================================================================
--- grunt.js	(revision 31200)
+++ grunt.js	(working copy)
@@ -12,6 +12,7 @@

 module.exports = function (grunt) {

+  console.log('hello world');
   // Project configuration.
   grunt.initConfig({
     lint: {
@@ -19,10 +20,6 @@
         'packages/services.web/{!(test)/**/,}*.js',
         'packages/error/**/*.js'
       ],
-      scripts: [
-        'grunt.js',
-        'db/**/*.js'
-      ],
       browser: [
         'packages/web/server.js',
         'packages/web/server/**/*.js',

Index: languages/ini.js
===================================================================
--- languages/ini.js    (revision 199)
+++ languages/ini.js    (revision 200)
@@ -1,8 +1,7 @@
 hljs.LANGUAGES.ini =
 {
   case_insensitive: true,
-  defaultMode:
-  {
+  defaultMode: {
     contains: ['comment', 'title', 'setting'],
     illegal: '[^\\s]'
   },

*** /path/to/original timestamp
--- /path/to/new      timestamp
***************
*** 1,3 ****
--- 1,9 ----
+ This is an important
+ notice! It should
+ therefore be located at
+ the beginning of this
+ document!

! compress the size of the
! changes.

  It is important to spell

Docker

FROM ubuntu

# Install vnc, xvfb in order to create a 'fake' display and firefox
RUN apt-get update && apt-get install -y x11vnc xvfb firefox
RUN mkdir ~/.vnc

# Setup a password
RUN x11vnc -storepasswd 1234 ~/.vnc/passwd

# Autostart firefox (might not be the best way, but it does the trick)
RUN bash -c 'echo "firefox" >> /.bashrc'

EXPOSE 5900
CMD ["x11vnc", "-forever", "-usepw", "-create"]

Elixir

require Logger

def accept(port) do
  {:ok, socket} = :gen_tcp.listen(port,
                    [:binary, packet: :line, active: false, reuseaddr: true])
  Logger.info "Accepting connections on port #{port}"
  loop_acceptor(socket)
end

defp loop_acceptor(socket) do
  {:ok, client} = :gen_tcp.accept(socket)
  serve(client)
  loop_acceptor(socket)
end

defp serve(socket) do
  socket
  |> read_line()
  |> write_line(socket)

  serve(socket)
end

defp read_line(socket) do
  {:ok, data} = :gen_tcp.recv(socket, 0)
  data
end

defp write_line(line, socket) do
  :gen_tcp.send(socket, line)
end

Erlang

circular(Defs) ->
  [ { { Type, Base }, Fields } ||
    { { Type, Base }, Fields } <- Defs, Type == msg, circular(Base, Defs) ].

circular(Base, Defs) ->
  Fields = proplists:get_value({ msg, Base }, Defs),
  circular(Defs, Fields, [Base]).

circular(_Defs, [], _Path) ->
  false;
circular(Defs, [Field | Fields], Path) ->
  case Field#field.type of
    { msg, Type } ->
      case lists:member(Type, Path) of
        false ->
          Children = proplists:get_value({ msg, Type }, Defs),
          case circular(Defs, Children, [Type | Path]) of
            false -> circular(Defs, Fields, Path);
            true  -> true
          end;
        true ->
          Type == lists:last(Path) andalso
            (length(Path) == 1 orelse not is_tree(Path))
      end;
    _ ->
      circular(Defs, Fields, Path)
  end.

F#

/// Asynchronously download retangles from the server
/// and decode the JSON format to F# Rectangle record
let [<Js>] getRectangles () : Async<Rectangle[]> = async {
  let req = XMLHttpRequest()
  req.Open("POST", "/get", true)
  let! resp = req.AsyncSend()
  return JSON.parse(resp) }

/// Repeatedly update rectangles after 0.5 sec
let [<Js>] updateLoop () = async {
  while true do
    do! Async.Sleep(500)
    let! rects = getRectangles()
    cleanRectangles()
    rects |> Array.iter createRectangle }

Go

package main

import "fmt"

func counter(id int, channel chan int, closer bool) {
  for i := 0; i < 10000000; i++ {
    fmt.Println("process", id," send", i)
    channel <- 1
  }
  if closer { close(channel ) }
}

func main() {
  channel := make(chan int)
  go counter(1, channel, false)
  go counter(2, channel, true)

  x := 0

  // receiving data from channel
  for i := range channel {
    fmt.Println("receiving")
    x += i
  }

  fmt.Println(x)
}

package main

import "fmt"

func main() {
    ch := make(chan float64)
    ch <- 1.0e10    // magic number
    x, ok := <- ch
    defer fmt.Println(`exitting now\`)
    go println(len("hello world!"))
    return
}

HTML

<!doctype html>
<html class="no-js" lang="">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <title>HTML5 Boilerplate</title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <link rel="apple-touch-icon" href="apple-touch-icon.png">
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/main.css">
    <script src="js/vendor/modernizr-2.8.3.min.js"></script>
  </head>
  <body>
    <p>Hello world! This is HTML5 Boilerplate.</p>
  </body>
</html>

<!DOCTYPE html>
<title>Title</title>

<style>body {width: 500px;}</style>

<script type="application/javascript">
  function $init() {return true;}
</script>

<body>
  <p checked class="title" id='title'>Title</p>
  <!-- here goes the rest of the page -->
</body>

HTTP

POST /task?id=1 HTTP/1.1
Host: example.org
Content-Type: application/json; charset=utf-8
Content-Length: 137

{
  "status": "ok",
  "extended": true,
  "results": [
    {"value": 0, "type": "int64"},
    {"value": 1.0e+3, "type": "decimal"}
  ]
}

Java

import java.util.LinkedList;
import java.lang.reflect.Array;

public class UnsortedHashSet<E> {

  private static final double LOAD_FACTOR_LIMIT = 0.7;

  private int size;
  private LinkedList<E>[] con;

  public UnsortedHashSet() {
    con  = (LinkedList<E>[])(new LinkedList[10]);
  }

  public boolean add(E obj) {
    int oldSize = size;
    int index = Math.abs(obj.hashCode()) % con.length;
    if (con[index] == null)
      con[index] = new LinkedList<E>();
    if (!con[index].contains(obj)) {
      con[index].add(obj);
      size++;
    }
    if (1.0 * size / con.length > LOAD_FACTOR_LIMIT)
      resize();
    return oldSize != size;
  }

  private void resize() {
    UnsortedHashSet<E> temp = new UnsortedHashSet<E>();
    temp.con = (LinkedList<E>[])(new LinkedList[con.length * 2 + 1]);
    for (int i = 0; i < con.length; i++) {
      if (con[i] != null)
        for (E e : con[i])
          temp.add(e);
    }
    con = temp.con;
  }

  public int size() {
    return size;
  }
}

/**
 * @author John Smith <john.smith@example.com>
*/
package l2f.gameserver.model;

public abstract strictfp class L2Char extends L2Object {
  public static final Short ERROR = 0x0001;

  public void moveTo(int x, int y, int z) {
    _ai = null;
    log("Should not be called");
    if (1 > 5) { // wtf!?
      return;
    }
  }
}

JavaScript

var Math = require('lib/math');

var _extends = function (target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i];
    for (var key in source) {
      target[key] = source[key];
    }
  }

  return target;
};

var e = exports.e = 2.71828182846;
exports['default'] = function (x) {
  return Math.exp(x);
};

module.exports = _extends(exports['default'], exports);

function $initHighlight(block, cls) {
  try {
    if (cls.search(/\bno\-highlight\b/) != -1)
      return process(block, true, 0x0F) +
             ` class="${cls}"`;
  } catch (e) {
    /* handle exception */
  }
  for (var i = 0 / 2; i < classes.length; i++) {
    if (checkCondition(classes[i]) === undefined)
      console.log('undefined');
  }

  return (
    <div>
      <web-component>{block}</web-component>
    </div>
  )
}

export  $initHighlight;

JSON

{
  "name": "mkdocs-material",
  "version": "0.2.4",
  "description": "A Material Design theme for MkDocs",
  "homepage": "http://squidfunk.github.io/mkdocs-material/",
  "authors": [
    "squidfunk <martin.donath@squidfunk.com>"
  ],
  "license": "MIT",
  "main": "Gulpfile.js",
  "scripts": {
    "start": "./node_modules/.bin/gulp watch --mkdocs",
    "build": "./node_modules/.bin/gulp build --production"
  }
  ...
}

Julia

using MXNet

mlp = @mx.chain mx.Variable(:data)             =>
  mx.FullyConnected(name=:fc1, num_hidden=128) =>
  mx.Activation(name=:relu1, act_type=:relu)   =>
  mx.FullyConnected(name=:fc2, num_hidden=64)  =>
  mx.Activation(name=:relu2, act_type=:relu)   =>
  mx.FullyConnected(name=:fc3, num_hidden=10)  =>
  mx.SoftmaxOutput(name=:softmax)

# data provider
batch_size = 100
include(Pkg.dir("MXNet", "examples", "mnist", "mnist-data.jl"))
train_provider, eval_provider = get_mnist_providers(batch_size)

# setup model
model = mx.FeedForward(mlp, context=mx.cpu())

# optimization algorithm
optimizer = mx.SGD(lr=0.1, momentum=0.9)

# fit parameters
mx.fit(model, optimizer, train_provider, n_epoch=20, eval_data=eval_provider)

Less

@import "fruits";

@rhythm: 1.5em;

@media screen and (min-resolution: 2dppx) {
    body {font-size: 125%}
}

section > .foo + #bar:hover [href*="less"] {
    margin:     @rhythm 0 0 @rhythm;
    padding:    calc(5% + 20px);
    background: #f00ba7 url(http://placehold.alpha-centauri/42.png) no-repeat;
    background-image: linear-gradient(-135deg, wheat, fuchsia) !important ;
    background-blend-mode: multiply;
}

@font-face {
    font-family: /* ? */ 'Omega';
    src: url('../fonts/omega-webfont.woff?v=2.0.2');
}

.icon-baz::before {
    display:     inline-block;
    font-family: "Omega", Alpha, sans-serif;
    content:     "\f085";
    color:       rgba(98, 76 /* or 54 */, 231, .75);
}

Lua

local ffi = require("ffi")

ffi.cdef[[
  void Sleep(int ms);
  int poll(struct pollfd *fds, unsigned long nfds, int timeout);
]]

local sleep
if ffi.os == "Windows" then
  function sleep(s)
    ffi.C.Sleep(s*1000)
  end
else
  function sleep(s)
    ffi.C.poll(nil, 0, s * 1000)
  end
end

for i = 1,160 do
  io.write("."); io.flush()
  sleep(0.01)
end
io.write("\n")

--[[
Simple signal/slot implementation
]]
local signal_mt = {
    __index = {
        register = table.insert
    }
}
function signal_mt.__index:emit(... --[[ Comment in params ]])
    for _, slot in ipairs(self) do
        slot(self, ...)
    end
end
local function create_signal()
    return setmetatable({}, signal_mt)
end

-- Signal test
local signal = create_signal()
signal:register(function(signal, ...)
    print(...)
end)
signal:emit('Answer to Life, the Universe, and Everything:', 42)

--[==[ [=[ [[
Nested ]]
multi-line ]=]
comment ]==]
[==[ Nested
[=[ multi-line
[[ string
]] ]=] ]==]

Kotlin

import kotlin.lang.test

trait A {
    fun x()
}

fun xxx() : Int {
	return 888
}

public fun main(args : Array<String>) {
}

Makefile

# Makefile

BUILDDIR      = _build
EXTRAS       ?= $(BUILDDIR)/extras

.PHONY: main clean

main:
	@echo "Building main facility..."
	build_main $(BUILDDIR)

clean:
	rm -rf $(BUILDDIR)/*

Markdown

# hello world

you can write text [with links](http://example.com) inline or [link references][1].

* one _thing_ has *em*phasis
* two __things__ are **bold**

[1]: http://example.com

---

hello world
===========

<this_is inline="xml"></this_is>

> markdown is so cool

    so are code segments

1. one thing (yeah!)
2. two thing `i can write code`, and `more` wipee!

MySQL

SELECT
  Employees.EmployeeID,
  Employees.Name,
  Employees.Salary,
  Manager.Name AS Manager
FROM
  Employees
LEFT JOIN
  Employees AS Manager
ON
  Employees.ManagerID = Manager.EmployeeID
WHERE
  Employees.EmployeeID = '087652';

Objective-C

#import <UIKit/UIKit.h>
#import "Dependency.h"

@protocol WorldDataSource
@optional
- (NSString*)worldName;
@required
- (BOOL)allowsToLive;
@end

@property (nonatomic, readonly) NSString *title;
- (IBAction) show;
@end

Perl

# loads object
sub load
{
  my $flds = $c->db_load($id,@_) || do {
    Carp::carp "Can`t load (class: $c, id: $id): '$!'"; return undef
  };
  my $o = $c->_perl_new();
  $id12 = $id / 24 / 3600;
  $o->{'ID'} = $id12 + 123;
  #$o->{'SHCUT'} = $flds->{'SHCUT'};
  my $p = $o->props;
  my $vt;
  $string =~ m/^sought_text$/;
  $items = split //, 'abc';
  $string //= "bar";
  for my $key (keys %$p)
  {
    if(${$vt.'::property'}) {
      $o->{$key . '_real'} = $flds->{$key};
      tie $o->{$key}, 'CMSBuilder::Property', $o, $key;
    }
  }
  $o->save if delete $o->{'_save_after_load'};

  # GH-117
  my $g = glob("/usr/bin/*");

  return $o;
}

__DATA__
@@ layouts/default.html.ep
<!DOCTYPE html>
<html>
  <head><title><%= title %></title></head>
  <body><%= content %></body>
</html>
__END__

=head1 NAME
POD till the end of file

PHP

<?php

// src/AppBundle/Controller/LuckyController.php
namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Component\HttpFoundation\Response;

class LuckyController {

  /**
   * @Route("/lucky/number")
   */
  public function numberAction() {
    $number = mt_rand(0, 100);

    return new Response(
      '<html><body>Lucky number: '.$number.'</body></html>'
    );
  }
}

Protocol Buffers

syntax = "proto2";

package caffe;

// Specifies the shape (dimensions) of a Blob.
message BlobShape {
  repeated int64 dim = 1 [packed = true];
}

message BlobProto {
  optional BlobShape shape = 7;
  repeated float data = 5 [packed = true];
  repeated float diff = 6 [packed = true];

  // 4D dimensions -- deprecated.  Use "shape" instead.
  optional int32 num = 1 [default = 0];
  optional int32 channels = 2 [default = 0];
  optional int32 height = 3 [default = 0];
  optional int32 width = 4 [default = 0];
}

.properties

# .properties
! Exclamation mark = comments, too

key1 = value1
key2 : value2
key3   value3
key\ spaces multiline\
            value4
empty_key
! Key can contain escaped chars
\:\= = value5

Python

"""
  A very simple MNIST classifier.
  See extensive documentation at
  http://tensorflow.org/tutorials/mnist/beginners/index.md
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

# Import data
from tensorflow.examples.tutorials.mnist import input_data

import tensorflow as tf

flags = tf.app.flags
FLAGS = flags.FLAGS
flags.DEFINE_string('data_dir', '/tmp/data/', 'Directory for storing data')

mnist = input_data.read_data_sets(FLAGS.data_dir, one_hot=True)

sess = tf.InteractiveSession()

# Create the model
x = tf.placeholder(tf.float32, [None, 784])
W = tf.Variable(tf.zeros([784, 10]))
b = tf.Variable(tf.zeros([10]))
y = tf.nn.softmax(tf.matmul(x, W) + b)

Nginx config

user  www www;
worker_processes  2;
pid /var/run/nginx.pid;
error_log  /var/log/nginx.error_log  debug | info | notice | warn | error | crit;

events {
    connections   2000;
    use kqueue | rtsig | epoll | /dev/poll | select | poll;
}

http {
    log_format main      '$remote_addr - $remote_user [$time_local] '
                         '"$request" $status $bytes_sent '
                         '"$http_referer" "$http_user_agent" '
                         '"$gzip_ratio"';

    send_timeout 3m;
    client_header_buffer_size 1k;

    gzip on;
    gzip_min_length 1100;

    #lingering_time 30;

    server {
        server_name   one.example.com  www.one.example.com;
        access_log   /var/log/nginx.access_log  main;

        rewrite (.*) /index.php?page=$1 break;

        location / {
            proxy_pass         http://127.0.0.1/;
            proxy_redirect     off;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            charset            koi8-r;
        }

        location /api/ {
            fastcgi_pass 127.0.0.1:9000;
        }

        location ~* \.(jpg|jpeg|gif)$ {
            root         /spool/www;
        }
    }
}

Ruby

require 'finity/event'
require 'finity/machine'
require 'finity/state'
require 'finity/transition'
require 'finity/version'

module Finity
  class InvalidCallback < StandardError; end
  class MissingCallback < StandardError; end
  class InvalidState    < StandardError; end

  # Class methods to be injected into the including class upon inclusion.
  module ClassMethods

    # Instantiate a new state machine for the including class by accepting a
    # block with state and event (and subsequent transition) definitions.
    def finity options = {}, &block
      @finity ||= Machine.new self, options, &block
    end

    # Return the names of all registered states.
    def states
      @finity.states.map { |name, _| name }
    end

    # Return the names of all registered events.
    def events
      @finity.events.map { |name, _| name }
    end
  end

  # Inject methods into the including class upon inclusion.
  def self.included base
    base.extend ClassMethods
  end
end

# The Greeter class
class Greeter
  def initialize(name)
    @name = name.capitalize
  end

  def salute
    puts "Hello #{@name}!"
  end
end

g = Greeter.new("world")
g.salute

Rust

#[derive(Debug)]
pub enum State {
    Start,
    Transient,
    Closed,
}

impl From<&'a str> for State {
    fn from(s: &'a str) -> Self {
        match s {
            "start" => State::Start,
            "closed" => State::Closed,
            _ => unreachable!(),
        }
    }
}

Scala

// Every record of this DataFrame contains the label and
// features represented by a vector.
val df = sqlContext.createDataFrame(data).toDF("label", "features")

// Set parameters for the algorithm.
// Here, we limit the number of iterations to 10.
val lr = new LogisticRegression().setMaxIter(10)

// Fit the model to the data.
val model = lr.fit(df)

// Inspect the model: get the feature weights.
val weights = model.weights

// Given a dataset, predict each point's label, and show the results.
model.transform(df).show()g

SCSS

@import "compass/reset";

// variables
$colorGreen: #008000;
$colorGreenDark: darken($colorGreen, 10);

@mixin container {
    max-width: 980px;
}

// mixins with parameters
@mixin button($color:green) {
    @if ($color == green) {
        background-color: #008000;
    }
    @else if ($color == red) {
        background-color: #B22222;
    }
}

button {
    @include button(red);
}

div,
.navbar,
#header,
input[type="input"] {
    font-family: "Helvetica Neue", Arial, sans-serif;
    width: auto;
    margin: 0 auto;
    display: block;
}

.row-12 > [class*="spans"] {
    border-left: 1px solid #B5C583;
}

// nested definitions
ul {
    width: 100%;
    padding: {
        left: 5px; right: 5px;
    }
  li {
      float: left; margin-right: 10px;
      .home {
          background: url('http://placehold.it/20') scroll no-repeat 0 0;
    }
  }
}

.banner {
    @extend .container;
}

a {
  color: $colorGreen;
  &:hover { color: $colorGreenDark; }
  &:visited { color: #c458cb; }
}

@for $i from 1 through 5 {
    .span#{$i} {
        width: 20px*$i;
    }
}

@mixin mobile {
  @media screen and (max-width : 600px) {
    @content;
  }
}

Shell Session

$ echo $EDITOR
vim
$ git checkout master
Switched to branch 'master'
Your branch is up-to-date with 'origin/master'.
$ git push
Everything up-to-date
$ echo 'All
> done!'
All
done!

SQL

CREATE TABLE "topic" (
    "id" serial NOT NULL PRIMARY KEY,
    "forum_id" integer NOT NULL,
    "subject" varchar(255) NOT NULL
);
ALTER TABLE "topic"
ADD CONSTRAINT forum_id FOREIGN KEY ("forum_id")
REFERENCES "forum" ("id");

-- Initials
insert into "topic" ("forum_id", "subject")
values (2, 'D''artagnian');

Swift

import Foundation

@objc class Person: Entity {
  var name: String!
  var age:  Int!

  init(name: String, age: Int) {
    /* /* ... */ */
  }

  // Return a descriptive string for this person
  func description(offset: Int = 0) -> String {
    return "\(name) is \(age + offset) years old"
  }
}

TOML, also INI

; boilerplate
[package]
name = "some_name"
authors = ["Author"]
description = "This is \
a description"

[[lib]]
name = ${NAME}
default = True
auto = no
counter = 1_000

TypeScript

class MyClass {
  public static myValue: string;
  constructor(init: string) {
    this.myValue = init;
  }
}
import fs = require("fs");
module MyModule {
  export interface MyInterface extends Other {
    myProperty: any;
  }
}
declare magicNumber number;
myArray.forEach(() => { }); // fat arrow syntax

XML

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mainTag SYSTEM "some.dtd" [ENTITY % entity]>
<?oxygen RNGSchema="some.rng" type="xml"?>
<xs:main-Tag xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <!-- This is a sample comment -->
  <childTag attribute="Quoted Value" another-attribute='Single quoted value'
      a-third-attribute='123'>
    <withTextContent>Some text content</withTextContent>
    <withEntityContent>Some text content with &lt;entities&gt; and
      mentioning uint8_t and int32_t</withEntityContent>
    <otherTag attribute='Single quoted Value'/>
  </childTag>
  <![CDATA[ some CData ]]>
</main-Tag>

YAML

---
# comment
string_1: "Bar"
string_2: 'bar'
string_3: bar
inline_keys_ignored: sompath/name/file.jpg
keywords_in_yaml:
  - true
  - false
  - TRUE
  - FALSE
  - 21
  - 21.0
  - !!str 123
"quoted_key": &foobar
  bar: foo
  foo:
  "foo": bar

reference: *foobar

multiline_1: |
  Multiline
  String
multiline_2: >
  Multiline
  String
multiline_3: "
  Multiline string
  "

ansible_variables: "foo {{variable}}"

array_nested:
- a
- b: 1
  c: 2
- b
- comment