JSFiddle - React, Tailwind, and code Playground

JavaScript

function sum(num) {
	if (num >= 1) {
  	return ++num
  } else {
  	return num
  }
}

var calc = sum();
calc(1); // 1
calc(3); // 4

var calc2 = sum();
calc2(1); // 1
calc2(4); // 5