SoccerProject find captain

let highest_percentage = {value: 0, name: ""}
const PLAYERS_MAX = 11
let current_checked_players = 0

let observer = new MutationObserver(function (mutations) {
    mutations.forEach(function (mutation) {
        if (mutation.addedNodes.length) {
            player_properties(mutation.addedNodes[0])
        }
    })
})

Array.from(document.getElementsByTagName("tr"))
    .filter(function(a) {
        let tds = Array.from(a.children)
        return a.id && tds.length > 1 && tds[1].className && tds[1].className !== "posSUB";
    })
    .forEach(function(tr) {
        let id = tr.id.match(/[0-9]+/g)[0]
        let properties = document.querySelector('#td_id_Player' + id)
        let properties_table = properties.querySelector("table")
        if (!properties_table) {
            observer.observe(properties, {
                childList: true
            });
            getPlayer(id, 'id_Player')
        } else {
            player_properties(properties_table)
        }

    })

function player_properties(node) {
    let jersey_name = document.querySelector("#trPlayer" + node.parentNode.id.match(/[0-9]+/g)[0]).children[1].innerText
    let name = jersey_name.match(/[0-9]+\. (.+)/)[1]
    let percentage = parseInt(node.getElementsByTagName("td")[2].innerText)
    if (percentage > highest_percentage["value"]) {
        highest_percentage["value"] = percentage
        highest_percentage["name"] = name
    }
    current_checked_players += 1
    if (current_checked_players === PLAYERS_MAX) {
        console.log("Captain should be " + highest_percentage["name"] + " (" + highest_percentage["value"] + "%)");
    }
}