// これまでの関数
var fnc = function(a, b) {
return a + b;
};
document.write(fnc(2, 3) + "<br>");
// アロー関数1
var arrow1 = (a, b) => {
return a + b;
};
document.write(arrow1(3, 4) + "<br>");
// アロー関数2(処理がreturnだけなら、省略可能)
var arrow2 = (a, b) => a + b;
document.write(arrow2(4, 5) + "<br>");
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