如何在javascript箭头函数中返回嵌套函数的结果？

Question

Can't figure out how to return result of the nested function in arrow function.

How to express this one (works fine):

var stopEating = (function() {
    var loadedStomach = false;
    return function() {
        if(!loadedStomach){
            loadedStomach = true;
            console.log('Stop eating');
        }};
})();

as an arrow function (doesn't work properly):

const stopEating = () => {
    let loadedStomach = false;
    return () => {
        if(!loadedStomach) {
            loadedStomach = true;
            console.log('Its enough eating!');
        }};
};

Answer 1

You need to call the function in order to get the results, thus, adding the parentheses at the end.

const stopEating = (() => {
    let loadedStomach = false;
    return () => {
        if(!loadedStomach) {
            loadedStomach = true;
            console.log('Its enough eating!');
        }
    };
})();

Answer 2

Into the first example, you created Immediately Invoked Function Expression (IIFE) .

It's a JavaScript function that runs as soon as it is defined. That's why you receive internal function, which prints "Stop Eating".

To realize this pattern you just need to wrap arrow function:

const stopEating = (() => {
    let loadedStomach = false;
    return () => {
        if(!loadedStomach) {
            loadedStomach = true;
            console.log('Its enough eating!');
        }
    };
})();