Suresh sureshg

Transducers are composable algorithmic transformations. They are independent from the context of their input and output sources and specify only the essence of the transformation in terms of an individual element. Because transducers are decoupled from input or output sources, they can be used in many different processes - collections, streams, channels, observables, etc. Transducers compose directly, without awareness of input or creation of intermediate aggregates.

Original source code (from Oct 12, 2014):

Transducers.kt: https://gist.github.com/Spasi/4052e4e8c8d88a7325fb
TransducersTest.kt: https://gist.github.com/Spasi/2a9d7d420b20f37513d5

Change notes:

Converted to Kotlin 1.0.0-beta-3595 and JUnit 4.12.

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

	import java.lang.instrument.*;
	import java.security.ProtectionDomain;

	public class GetBytecode implements ClassFileTransformer {
	private static Instrumentation inst;

	public static synchronized void agentmain(String args, Instrumentation inst) {
	GetBytecode.inst = inst;
	}

	/*
	* Copyright (C) 2016 Jeff Gilfelt.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	package completable.async;


	import java.util.Collection;
	import java.util.List;
	import java.util.concurrent.*;

	import static java.util.concurrent.Executors.callable;

	/**

	_hashCode java/lang/Object.hashCode()I
	_getClass java/lang/Object.getClass()Ljava/lang/Class;
	_clone java/lang/Object.clone()Ljava/lang/Object;
	_dabs java/lang/Math.abs(D)D
	_dsin java/lang/Math.sin(D)D
	_dcos java/lang/Math.cos(D)D
	_dtan java/lang/Math.tan(D)D
	_datan2 java/lang/Math.atan2(DD)D
	_dsqrt java/lang/Math.sqrt(D)D
	_dlog java/lang/Math.log(D)D

	language: dart
	dart:
	- stable
	- dev
	sudo: false
	cache:
	directories:
	- $HOME/.pub-cache
	with_content_shell: true
	before_install:

	<!DOCTYPE html>

	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Dart SVG Animation</title>
	<link rel="stylesheet" href="styles.css">
	<script type="application/dart" src="main.dart"></script>
	</head>

	<?xml version="1.0" encoding="utf-8"?>
	<!--
	Copyright (C) 2015 The Android Open Source Project

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0