JavaScript：関数の記述方法いろいろ

// main.js

function toHex1(n){
    return n.toString(16);
}

const toHex2 = function(n){
    return n.toString(16);
};

/*
const toHex3 = (n) => {
    return n.toString(16);
};
*/

// 単一の処理ならreturnも省略可能
const toHex4 = (n) => n.toString(16);

// 起動時の処理
window.addEventListener("load", ()=>{
    console.log(toHex1(10));
    console.log(toHex2(11));
//    console.log(toHex3(12));
    console.log(toHex4(12));    
});