num validator

function () {
    let btn = document.getElementsByTagName("button")[0];
    btn.addEventListener("click",()=>ValidateInput());
    const arrayWeights=[2,4,8,5,10,9,7,3,6];

    function ValidateInput(){
        let input=document.querySelector("div input").value;
        let nums=(input).split("").map(Number);
        let lastDigit=nums.pop();
        let activeWeights= arrayWeights.slice(0,nums.length);
        let total=nums.reduce((sum, val, i) => sum + (val * activeWeights[i]), 0)%11<10?
        nums.reduce((sum, val, i) => sum + (val * activeWeights[i]), 0) %11:0;

        let valid=total==lastDigit?"This number is Valid!":"This number is NOT Valid!";
        let responseEl=document.getElementById("response");
        responseEl.textContent=valid;
        console.log("bam");
    }
}