Tom Ragle tragle

Programming as Theory Building

Peter Naur

Peter Naur's classic 1985 essay "Programming as Theory Building" argues that a program is not its source code. A program is a shared mental construct (he uses the word theory) that lives in the minds of the people who work on it. If you lose the people, you lose the program. The code is merely a written representation of the program, and it's lossy, so you can't reconstruct

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

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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	# Makefile for transpiling with Babel in a Node app, or in a client- or
	# server-side shared library.

	.PHONY: all clean

	# Install `babel-cli` in a project to get the transpiler.
	babel := node_modules/.bin/babel

	# Identify modules to be transpiled by recursively searching the `src/`
	# directory.

	13:15 <xQuasar> \| HASKELL IS FOR FUCKIN FAGGOTS. YOU'RE ALL A BUNCH OF
	\| FUCKIN PUSSIES
	13:15 <xQuasar> \| JAVASCRIPT FOR LIFE FAGS
	13:16 <luite> \| hello
	13:16 <ChongLi> \| somebody has a mental illness!
	13:16 <merijn> \| Wow...I suddenly see the error of my ways and feel
	\| compelled to write Node.js!
	13:16 <genisage> \| hi
	13:16 <luite> \| you might be pleased to learn that you can compile
	\| haskell to javascript now