'use strict';
  
  var floor = Math.floor;
  
  module.exports = function (x) {
  	if (isNaN(x)) return NaN;
  	x = Number(x);
  	if (x === 0) return x;
  	if (x === Infinity) return Infinity;
  	if (x === -Infinity) return -Infinity;
  	if (x > 0) return floor(x);
  	return -floor(-x);
  };