JSFiddle - React, Tailwind, and code Playground

JavaScript

function isNumeric(sText, base) {
    return !isNaN(sText*1); 
}


document.write(isNumeric('10s'), '<br>');
document.write(isNumeric('20'), '<br>');
document.write(isNumeric('0x10'), '<br>');
document.write(isNumeric('3.14'), '<br>');