JSFiddle - React, Tailwind, and code Playground

HTML

<script>document.write(highAndLow("1 2 3 4 5"));</script>

JavaScript

function highAndLow(numbers){
			var value = numbers.split(" ");
			var max_value = null;
			var min_value = null;

			for (var i = 0; i < value.length; i++) {

				value[i] *= 1; // string -> number로 형변환
				               // 
				if (i == 0) {
					max_value = value[i];
					min_value = value[i];					
				}

				if (value[i] > max_value) {

					max_value = value[i];

				} else if (value[i] < min_value) {

					min_value = value[i];
				}
			}

			max_value += "";
			min_value += "";
			return max_value + " " + min_value;
		}