▼ If you don't know about Closure, I've already written about it
There is this closure function
function addCountFactory(num) {
function addCount(value) {
return num + value;
}
return addCount;
}
const addOne = addCountFactory(1);
const result = addOne(10);
console.log(result); // 11
If I change it to arrow function, it would be like this
1
const addCountFactory = num => { // ⭐ here
function addCount(value) {
return num + value;
}
return addCount;
}
2
remove unnecessary return
const addCountFactory = num => {
return function addCount(value) { // ⭐ here
return num + value;
}
// ⭐ delete "return addCount"
}
3
name of function is not necessary
const addCountFactory = num => {
return function(value) { // ⭐ here
return num + value;
}
}
4
just delete { } block
const addCountFactory = num => function(value) {
return num + value;
}
5
change to arrow function
const addCountFactory = num => value => num + value;
When you see it at first time, you would react like "wtf???", but actually it's just closure. Function in function
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