JSFiddle - React, Tailwind, and code Playground

by chovy

HTML

<div>
  <p>
    <input id="in" type="text" placeholder="Enter number">
  </p>

  <p>
    <span id="out"></span>
  </p>
</div>

JavaScript

var in 	= document.getElementById('in');
var out = document.getElementById('out');

in.onEnter = function(e){
	out.innerHTML = this.value;
};

function insertDashes(str){
	return str.replace(/([13579])(?=[13579])/, '$1-');
}