JSFiddle - React, Tailwind, and code Playground

JavaScript

var pingpong = {
    paddleA: {
        speed: 5
    },
    paddleB: {
        speed: 6
    },
    paddleAI: {
        AI1: "paddleA",
        AI2: "paddleB",
    }
}
    
    
for (paddle in pingpong.paddleAI) {
    var keyVal = pingpong.paddleAI[paddle]; 
    if (pingpong[keyVal].speed)
        console.log(pingpong[keyVal].speed);
    else  //if you want
        console.log("no speed on " + keyVal);
}