rgb-to-hex/index.js

Convert rgb value to hex

'use strict';

var parseRgb = require('parse-rgb');

module.exports = function (rgb) {
	if (typeof rgb !== 'string') {
		throw new TypeError('Expected a string');
	}

    var rgb = parseRgb(rgb);

    function toHex(value) {
        var
            HEXI = "0123456789ABCDEF",
            num = parseInt(value, 10)
        ;

            if (num < 0) { return '00'; }

            num = Math.max(0, Math.min(num, 255));

        return HEXI.charAt((num - num % 16) / 16) + HEXI.charAt(num % 16);
    }

    return toHex(rgb['red']) + toHex(rgb['green']) + toHex(rgb['blue']);
};