箭头函数返回函数文本而不是结果（javascript）

Question

The arrow function returns the function text - "(n) => 5 + n" and not the result (6). What am I doing wrong?

let n = 1;
let newText = (n) => 5 + n;
document.write(newText);

Answer 1

You're not calling the function:

document.write(newText(42));

This has nothing to do with => or let , by the way:

function newText(n) { return 5 + n; }
document.write(newText);

has the same problem.

Answer 2

Call the function

document.write(newText(5));

Answer 3

You need to call the arrow function.

JS Fiddle

let n = 1;
let newText = (n) => 5 + n;
document.write(newText(n));