var Dimension = require(“../tree/dimension”);

var MathHelper = function() { }; MathHelper._math = function (fn, unit, n) {

if (!(n instanceof Dimension)) {
    throw { type: "Argument", message: "argument must be a number" };
}
if (unit == null) {
    unit = n.unit;
} else {
    n = n.unify();
}
return new Dimension(fn(parseFloat(n.value)), unit);

}; module.exports = MathHelper;