What is this code mean? Is it anonymous function?

Question

I am studying about the React using textbook. There are some codes I cant understand in the book.

const loggerMiddleware = store => next => action => {
}

I know the anonymous function in the javascript.

(a, b, c) => {
}

But, what is this?

store => next => action => {
}

please help me.

score 1 · Answer 1 · answered Jun 26 '19 at 13:32

1

It's a higher-order function, i.e. a function that returns a function. It means the same as

store => next => {
    return action => { }
}

answered Jun 26 '19 at 13:32

mbojko

@NJS right, so it's a function that returns a function that returns a function. – Pointy Jun 26 '19 at 13:34
Then, this code mean same? (store) => { return (next) => { return (action) => { } } } – NJS Jun 26 '19 at 13:35
thank you for your kind answer~! – NJS Jun 26 '19 at 13:36

1 Answers1