How to get a variable from an anonymous function? How do I get the X position of the mouse to be passed to the platform object?

Question

JavaScript

let position = document.getElementById('position')
let mx
function callback(event){
    mx = event.pageX
}
window.onmousemove = callback
console.log(mx)

let platform = {
    x: mx - 100,
    y: 575,
    width: 200,
    height: 25,
    color: 'blue' 
}

Answer 1

x: _=>mx - 100,
//....
console.log(platform.x())