David Novakovic dpnova

This cheat sheet originated from the forum, credits to Laurent Poulain. We copied it and changed or added a few things.

Evaluation Rules

Call by value: evaluates the function arguments before calling the function
Call by name: evaluates the function first, and then evaluates the arguments if need be

    def example = 2      // evaluated when called
    val example = 2      // evaluated immediately

start new:

tmux

start new with session name:

tmux new -s myname

	<!--
	* Copyright (c) 2021 GraphQL Contributors
	* All rights reserved.
	*
	* This code is licensed under the MIT license.
	* Use it however you wish.
	-->
	<!DOCTYPE html>
	<html>
	<head>

	val uri = "http://www.yahoo.com"
	val reqEntity = Array[Byte]()

	val respEntity = for {
	request <- Marshal(reqEntity).to[RequestEntity]
	response <- Http().singleRequest(HttpRequest(method = HttpMethods.POST, uri = uri, entity = request))
	entity <- Unmarshal(response.entity).to[ByteString]
	} yield entity

	val payload = respEntity.andThen {

	# vim: set fileencoding=utf8
	'''
	References
	- http://stackoverflow.com/a/1966188
	- http://en.wikipedia.org/wiki/Tree_(data_structure)

	$ python suggest.py prefix
	'''
	import sys
	import redis

	import sys, os, glob
	from datetime import datetime

	sys.path.append(os.environ.get("MAHOUT_CORE"))
	for jar in glob.glob(os.environ.get("MAHOUT_JAR_DIR") + "/*.jar"):
	sys.path.append(jar)

	from org.apache.mahout.common import RandomUtils
	from org.apache.mahout.cf.taste.common import TasteException
	from org.apache.mahout.cf.taste.eval import *

	import simplejson as json
	import lxml

	class objectJSONEncoder(json.JSONEncoder):
	"""A specialized JSON encoder that can handle simple lxml objectify types
	>>> from lxml import objectify
	>>> obj = objectify.fromstring("<Book><price>1.50</price><author>W. Shakespeare</author></Book>")
	>>> objectJSONEncoder().encode(obj)
	'{"price": 1.5, "author": "W. Shakespeare"}'
	"""