convert to camel case in javascript code example

Example 1: convert camelcase to sentence case javascript

var text = 'helloThereMister';
var result = text.replace( /([A-Z])/g, " $1" );
var finalResult = result.charAt(0).toUpperCase() + result.slice(1);
console.log(finalResult);

Example 2: js camel case to snake case

var s1 = 'someTextHere';
var o1 = s1.split(/(?=[A-Z])/).join('_').toLowerCase();