JSFiddle - React, Tailwind, and code Playground

JavaScript

function myFunction(array) {
    var array = array.map(function(elementOfArrayAtIndex) {
        return parseInt(elementOfArrayAtIndex.replace(/\D/g, ''), 10);
    });
    var largest = Math.max.apply(null, array);
    console.log(largest);
}

myFunction(["509 - 111 - 1111", "509 - 222 - 2222", "509 - 333 - 3333"]);