Chang Liu fluency03

How to Eyeball Your ‘This’ Context in Javascript

The early programmer struggles with the Javascript keyword this. But understanding your this context is easier than it seems.

This is all about where a function is invoked. Often, early programmers worry about where the function was declared. Perhaps the function was declared in a specific file or a particular object. Surely this changes it's this!

Nope.

To understand this, we need to see where it is invoked. Nothing else matters, with one exception which we'll cover in a moment.

Contributing

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Pull Request Process

Ensure any install or build dependencies are removed before the end of the layer when doing a

	'use strict';

	const crypto = require('crypto');

	const ENCRYPTION_KEY = process.env.ENCRYPTION_KEY; // Must be 256 bytes (32 characters)
	const IV_LENGTH = 16; // For AES, this is always 16

	function encrypt(text) {
	let iv = crypto.randomBytes(IV_LENGTH);
	let cipher = crypto.createCipheriv('aes-256-cbc', new Buffer(ENCRYPTION_KEY), iv);

	package object mail {

	implicit def stringToSeq(single: String): Seq[String] = Seq(single)
	implicit def liftToOption[T](t: T): Option[T] = Some(t)

	sealed abstract class MailType
	case object Plain extends MailType
	case object Rich extends MailType
	case object MultiPart extends MailType

	/** Your task is to reason your way to which compiler
	* options which will be passed for each of
	* 1) sbt root/compile
	* 2) sbt p1/compile
	*/

	scalacOptions := Seq("-DSBT")

	scalacOptions in ThisBuild += "-D0"
	scalacOptions in Global += "-D1"

	import java.io.IOException;
	import java.nio.charset.StandardCharsets;
	import java.nio.file.Files;
	import java.util.Arrays;
	import java.util.Iterator;
	import java.util.Properties;
	import org.I0Itec.zkclient.ZkClient;
	import org.apache.kafka.clients.consumer.ConsumerRecord;
	import org.apache.kafka.clients.consumer.ConsumerRecords;
	import org.apache.kafka.clients.consumer.KafkaConsumer;

	package com.confluent.benstopford;

	import kafka.consumer.*;
	import kafka.javaapi.consumer.ConsumerConnector;
	import kafka.message.MessageAndMetadata;
	import kafka.serializer.StringDecoder;
	import kafka.server.KafkaConfig;
	import kafka.server.KafkaServerStartable;
	import org.apache.curator.test.TestingServer;
	import org.apache.kafka.clients.producer.KafkaProducer;

	# Elasticsearch Cheatsheet - an overview of commonly used Elasticsearch API commands

	# cat paths
	/_cat/allocation
	/_cat/shards
	/_cat/shards/{index}
	/_cat/master
	/_cat/nodes
	/_cat/indices
	/_cat/indices/{index}

	/**
	* $java Test
	* 1 == 1: true
	* 100 == 100: true
	* 127 == 127: true
	* new 127 == new 127: false
	* 128 == 128: false
	* 1000 == 1000: false
	*/

	/**
	* http://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.13.1
	*/


	import java.util.ArrayList;
	import java.util.List;

	public class Foo {