JSFiddle - React, Tailwind, and code Playground

JavaScript

function sortOnNum(a,b){
    return (a.split("_")[1] * 1 > b.split("_")[1] * 1)? 1:-1
    }
    
    var ar = new Array ("foo_1", "foo_19", "foo_3", "foo_1002");

ar.sort(sortOnNum);

alert(ar)