NV

0.1 + 0.2 // 0.30000000000000004
sumFloats([0.1, 0.2]) // 0.3

Alternatives

• http://stackoverflow.com/questions/13417670/precise-sum-of-floating-point-numbers

Kahan summation algorithm

• viktors/node-kahan#1

NV

var DeepLinkState = {
	linkState: function(path) {
		function setPath(obj, path, value) {
			var leaf = resolvePath(obj, path);
			leaf.obj[leaf.name] = value;
		}

		function getPath(obj, path) {
			var leaf = resolvePath(obj, path);
			return leaf.obj[leaf.name];

NV

NV

callWithNamed({one: 1, two: 2, three: 3}, function(three, one, two) {
    console.log(one, two, three);
});


function callWithNamed(dict, fn, context) {
    var newArgs = [];
    var parsedArgs = parseArgs(fn);
    for (var i = 0; i < parsedArgs.length; i++) {
        var name = parsedArgs[i];

NV

var style = document.createElement('style')
var iframe = document.createElement('iframe')
document.body.appendChild(iframe)
iframe.contentDocument.documentElement.appendChild(style)
iframe.style.display = 'none'

style.textContent = 'a {color: red}'
style.sheet // CSSStyleSheet
style.sheet.cssRules[0].cssText // 'a { color: red; }'
style.sheet.cssRules[0].selectorText // 'a'

NV

attachPair(document.getElementById('a'), document.getElementById('b'), createPolygon());
attachPair(document.getElementById('c'), document.getElementById('d'), createPolygon());
attachPair(document.getElementById('e'), document.getElementById('f'), createPolygon());

function attachPair(a, b) {
	var polygon = createPolygon();
	draggable(a, {
		onMove: function(e) {
			update(a, b, polygon);
		}

NV

pow

Serve static files in a current directory and create $current_dir.dev host name.

Usage

~/Sites/usercss.ru ➤ pow
open http://usercss.ru.dev/

~/Sites/n12v.com/static ➤ pow n12v

NV

function serve
	set NAME (basename $PWD)
	mkdir -p "$HOME/.pow/$NAME"
	ln -s $PWD "$HOME/.pow/$NAME/public"
	open "http://$NAME.dev"
end

NV

stopBefore.js

2min screencast

Examples

stopBefore(document, 'getElementById')
stopBefore('document.getElementById') // the same as the previous
stopBefore(Element.prototype, 'removeChild')

NV

<script src="devtools.js"></script>