convert hex to rgb

hexToRGB.js

// Adapted from http://www.javascripter.net/faq/hextorgb.htm
function hexer(h, from, to) { return parseInt((h.charAt(0)=="#" ? h.substring(1,7):h).substring(from,to), 16); }
function hexToR(h) {return hexer(h, 0, 2);}
function hexToG(h) {return hexer(h, 2, 4);}
function hexToB(h) {return hexer(h, 4, 6);}
function rnd(x) {return Math.round(100*x) / 100;}
function hexToIntRGB(h) { return [hexToR(h), hexToG(h), hexToB(h)]; }
function hexToDecRGB(h) { return [rnd(hexToR(h)/256), rnd(hexToG(h)/256), rnd(hexToB(h)/256)]; }
function decRGBToIntRGB(rgb) { return rgb.map(function(r) { return parseInt(r * 256);}); }
function intRGBToDecRGB(rgb) { return rgb.map(function(r) { return r / 256;}); }

/* example use */
// e.g., copied from http://bl.ocks.org/mbostock/5577023
var colors = ["#e41a1c","#377eb8","#4daf4a","#984ea3","#ff7f00","#ffff33","#a65628"];

for (var i = colors.length - 1; i >= 0; i--) {
	console.log(hexToDecRGB(colors[i]));
}
/* returns:
[0.65, 0.34, 0.16]
[1, 1, 0.2]
[1, 0.5, 0]
[0.59, 0.3, 0.64]
[0.3, 0.68, 0.29]
[0.21, 0.49, 0.72]
[0.89, 0.1, 0.11]
*/