slice (JavaScript Array Method)

const tnwNums = [20, 29, 30, 39, 40, 47, 50, 70];

function tnwFun1(){
    document.getElementById("demo").innerHTML = tnwNums.join(", ");
}

function tnwFun2(){
    let result = tnwNums.slice(1, 4);
    document.getElementById("demo").innerHTML = "The original is: " + tnwNums.join(", ");
    document.getElementById("demo1").innerHTML = "The new array is: " + result.join(", ");
}