map (JavaScript Array Method)

const tnwNum = [10, 20, 30, 40];

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

/**
function tnwFun2(){
    let result = tnwNum.map(Math.sqrt);
    document.getElementById("demo").innerHTML = result.join("
");
}*/

function tnwFun2(){
    let result = tnwNum.map(tnwFun3);
    document.getElementById("demo").innerHTML = result.join("
");
}

function tnwFun3(num){
    return num * 10;
}