'use strict'

module.exports = normalize;

function normalize (arr, dim) {
	if (!arr || arr.length == null) throw Error('Argument should be an array')

	if (dim == null) dim = 1
	else dim = Math.floor(dim)

	var bounds = Array(dim * 2)

	for (var offset = 0; offset < dim; offset++) {
		var max = -Infinity, min = Infinity, i = offset, l = arr.length;

		for (; i < l; i+=dim) {
			if (arr[i] > max) max = arr[i];
			if (arr[i] < min) min = arr[i];
		}

		bounds[offset] = min
		bounds[dim + offset] = max
	}

	return bounds;
}