Precise sum of float numbers.

README.markdown

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
• https://github.com/v8/v8/blob/4f451d16cbaf988b993bee29dc83d790d0fc266d/src/harmony-math.js#L141-L153

Kahan-Babuˇska-Summation Algorithm

• http://cage.ugent.be/~klein/papers/floating-point.pdf

sumFloats.js

	function sumFloats(floats) {
		var power = floats.reduce(function(acc, current) {
			var power = getPrecision(current.toString());
			return Math.max(power, acc);
		}, 0);

		var sum = floats.reduce(function(prev, current) {
			return prev + current;
		}, 0);

		var precision = Math.pow(10, power);
		return Math.round(sum * precision) / precision;
	}