my map polypill

HOC

const nums = [17, 1, 2, 3, -1]

const obj = (x) => {
	return {initial: x, square: x*x, positive: Math.sign(x) > 0 ? true : false}
}

Array.prototype.myMap = function(cb){
	const output = []
	for(let i = 0; i<this.length; i++){
    output.push(cb(this[i]))
  }
  return output
}

console.log(nums.myMap(obj))