Dave Herman dherman

I like computers and people. I’ve spent my career helping people express their thoughts through the code they write and the tools they use to write it.

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dherman / 1.js

Created May 20, 2012 22:50

chaining and indentation

	var users = records.map(function(record) {
	return record.username;
	})
	.filter(function(username) { return !!username })
	.map(function(username) {
	return username.toLowerCase();
	});

dherman / rivertrailexample.js

Created May 23, 2012 21:43

	var image = new ParallelArray(canvas);
	canvas.putImageData(image.map(toGrayScale).map(toPixel), 0, 0);

dherman / cascade.js

Created June 1, 2012 20:57

deep vs shallow update

	var obj = {
	a: {
	foo: 1,
	bar: 2
	},
	b: {
	quux: 3
	},
	c: 4
	};

dherman / map-dict.js

Created June 9, 2012 02:42

Map vs object for dictionary

	// A Dict class that works in ES6 using Map. Basically it's identical to Map, but
	// only expected to be used on string keys.

	function Dict() {
	this.elts = new Map();
	}

	// (string) -> any
	Dict.prototype.get = function get(key) {
	return this.elts.get(key);

dherman / nbody.rs

Created June 14, 2012 05:30 — forked from pcwalton/gist:2927607

Rust of Patrick's dreams, with Dave's method syntax :)

	import std.math.{PI, sqrt};

	struct Body {
	x: f64;
	y: f64;
	z: f64;
	vx: f64;
	vy: f64;
	vz: f64;
	mass: f64;

dherman / call-chaining.js

Created June 18, 2012 02:53

	// This isn't a proposal for JS. It's just a little thought experiment:
	//
	// What if I could go back in time and redesign the semicolon insertion rules?
	//
	// One of the most annoying things about ASI is when it doesn't kick in because
	// the following line starts with ( or [. The Go language has chosen a different
	// policy, inserting semicolons even when the following line starts with ( or [.
	// So in JS, when you see:

	f()

dherman / test.html

Created July 15, 2012 21:13

canvas line connecting compat issue

	<!doctype html>
	<head>
	<title>Canvas Test</title>
	<style>
	#c {
	border: solid 1px black;
	}
	</style>
	</head>
	<body>

dherman / closure.js

Created July 27, 2012 21:39

Analog to Function constructor for building closures

	(function() {

	var hasOwnProperty = Object.prototype.hasOwnProperty;

	var Function = hasOwnProperty.constructor;

	function isIdentifier(s) {
	return /[a-zA-Z_$][a-zA-Z_$0-9]*/.test(s);
	}

dherman / unselfish.js

Created July 28, 2012 18:08

Convert methods to unselfish functions

	Function.prototype.unselfish = (function(Fp, Ap) {
	var applyMethod = Fp.apply,
	callMethod = Fp.call;

	var apply = callMethod.bind(applyMethod),
	call = callMethod.bind(callMethod);

	var sliceMethod = Ap.slice;

	return function unselfish() {

dherman / beget.js

Created July 28, 2012 18:13

What everyone kinda wishes Object.create had been

	Object.beget = (function() {
	var create = Object.create,
	defineProperty = Object.defineProperty;

	// see https://gist.github.com/3194222
	var hasOwn = Object.prototype.hasOwnProperty.unselfish();

	return function beget(proto, own) {
	var result = create(proto);

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