Import/export when using reducers in Redux-React Native

I'm studying Redux with React Native and I have an example like this:

reducer.js

import {combineReducers} from "redux"; 

import {HomeReducer as home} from "../routes/Home/modules/home";



const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

createStore.js

import {createStore, applyMiddleware, compose} from 'redux';

import thunk from "redux-thunk";

import {createLogger} from 'redux-logger';



import makeRouteReducer from './reducer';



const log = createLogger({diff: true, collapsed: true});



export default (initialState = {}) => {

    const middleware = [thunk, log];

    const enhancers = ;



    return store = createStore(

        makeRouteReducer(),

        initialState,

        compose(

            applyMiddleware(...middleware),

            ...enhancers

        )

    );

}

It works fine but I don't understand why I have to use export default in reducer.js.

When I try to use

// reducer.js

export makeRootReducer

and

// createStore.js

import {makeRouteReducer} from './reducer';

It didn't work.

Please help me by explaining it in detail.

Thank you very much.

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

add a comment |

I'm studying Redux with React Native and I have an example like this:

reducer.js

import {combineReducers} from "redux"; 

import {HomeReducer as home} from "../routes/Home/modules/home";



const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

createStore.js

import {createStore, applyMiddleware, compose} from 'redux';

import thunk from "redux-thunk";

import {createLogger} from 'redux-logger';



import makeRouteReducer from './reducer';



const log = createLogger({diff: true, collapsed: true});



export default (initialState = {}) => {

    const middleware = [thunk, log];

    const enhancers = ;



    return store = createStore(

        makeRouteReducer(),

        initialState,

        compose(

            applyMiddleware(...middleware),

            ...enhancers

        )

    );

}

It works fine but I don't understand why I have to use export default in reducer.js.

When I try to use

// reducer.js

export makeRootReducer

and

// createStore.js

import {makeRouteReducer} from './reducer';

It didn't work.

Please help me by explaining it in detail.

Thank you very much.

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

add a comment |

I'm studying Redux with React Native and I have an example like this:

reducer.js

import {combineReducers} from "redux"; 

import {HomeReducer as home} from "../routes/Home/modules/home";



const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

createStore.js

import {createStore, applyMiddleware, compose} from 'redux';

import thunk from "redux-thunk";

import {createLogger} from 'redux-logger';



import makeRouteReducer from './reducer';



const log = createLogger({diff: true, collapsed: true});



export default (initialState = {}) => {

    const middleware = [thunk, log];

    const enhancers = ;



    return store = createStore(

        makeRouteReducer(),

        initialState,

        compose(

            applyMiddleware(...middleware),

            ...enhancers

        )

    );

}

It works fine but I don't understand why I have to use export default in reducer.js.

When I try to use

// reducer.js

export makeRootReducer

and

// createStore.js

import {makeRouteReducer} from './reducer';

It didn't work.

Please help me by explaining it in detail.

Thank you very much.

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

I'm studying Redux with React Native and I have an example like this:

reducer.js

import {combineReducers} from "redux"; 

import {HomeReducer as home} from "../routes/Home/modules/home";



const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

createStore.js

import {createStore, applyMiddleware, compose} from 'redux';

import thunk from "redux-thunk";

import {createLogger} from 'redux-logger';



import makeRouteReducer from './reducer';



const log = createLogger({diff: true, collapsed: true});



export default (initialState = {}) => {

    const middleware = [thunk, log];

    const enhancers = ;



    return store = createStore(

        makeRouteReducer(),

        initialState,

        compose(

            applyMiddleware(...middleware),

            ...enhancers

        )

    );

}

It works fine but I don't understand why I have to use export default in reducer.js.

When I try to use

// reducer.js

export makeRootReducer

and

// createStore.js

import {makeRouteReducer} from './reducer';

It didn't work.

Please help me by explaining it in detail.

Thank you very much.

javascript reactjs react-native redux

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

edited Nov 13 '18 at 3:20

Nguyễn Thanh Tú

4,6393827

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

asked Nov 13 '18 at 3:09

Nguyễn Văn Đại

236

add a comment |

1 Answer
1

active

oldest

votes

You're talking about named exports and default exports...

Example of a named export:

export const someFunction = () => {

   // some code here...

}

Now you can import this in another file like this:

import {someFumnction} from './nameOfFile'

But if you do:

export default function someFunction () {

   // some code here...

}

That's a default export and you have to import it like this:

import someFunction from './nameOfFile'

In your example if you change this:

const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

To this:

export const makeRootReducer = () => {

    return combineReducers({

        home

    });

};

It will become a named export and not a default export and now you can do:

import {makeRootReducer} from....

Hope that clarifies... And here is more info

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

1

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

|
show 1 more comment

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You're talking about named exports and default exports...

Example of a named export:

export const someFunction = () => {

   // some code here...

}

Now you can import this in another file like this:

import {someFumnction} from './nameOfFile'

But if you do:

export default function someFunction () {

   // some code here...

}

That's a default export and you have to import it like this:

import someFunction from './nameOfFile'

In your example if you change this:

const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

To this:

export const makeRootReducer = () => {

    return combineReducers({

        home

    });

};

It will become a named export and not a default export and now you can do:

import {makeRootReducer} from....

Hope that clarifies... And here is more info

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

1

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

|
show 1 more comment

You're talking about named exports and default exports...

Example of a named export:

export const someFunction = () => {

   // some code here...

}

Now you can import this in another file like this:

import {someFumnction} from './nameOfFile'

But if you do:

export default function someFunction () {

   // some code here...

}

That's a default export and you have to import it like this:

import someFunction from './nameOfFile'

In your example if you change this:

const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

To this:

export const makeRootReducer = () => {

    return combineReducers({

        home

    });

};

It will become a named export and not a default export and now you can do:

import {makeRootReducer} from....

Hope that clarifies... And here is more info

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

1

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

|
show 1 more comment

You're talking about named exports and default exports...

Example of a named export:

export const someFunction = () => {

   // some code here...

}

Now you can import this in another file like this:

import {someFumnction} from './nameOfFile'

But if you do:

export default function someFunction () {

   // some code here...

}

That's a default export and you have to import it like this:

import someFunction from './nameOfFile'

In your example if you change this:

const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

To this:

export const makeRootReducer = () => {

    return combineReducers({

        home

    });

};

It will become a named export and not a default export and now you can do:

import {makeRootReducer} from....

Hope that clarifies... And here is more info

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

You're talking about named exports and default exports...

Example of a named export:

export const someFunction = () => {

   // some code here...

}

Now you can import this in another file like this:

import {someFumnction} from './nameOfFile'

But if you do:

export default function someFunction () {

   // some code here...

}

That's a default export and you have to import it like this:

import someFunction from './nameOfFile'

In your example if you change this:

const makeRootReducer = () => {

    return combineReducers({

        home

    });

};



export default makeRootReducer;

To this:

export const makeRootReducer = () => {

    return combineReducers({

        home

    });

};

It will become a named export and not a default export and now you can do:

import {makeRootReducer} from....

Hope that clarifies... And here is more info

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

edited Nov 13 '18 at 4:22

answered Nov 13 '18 at 3:16

SakoBu

1,109317

answered Nov 13 '18 at 3:16

SakoBu

1,109317

answered Nov 13 '18 at 3:16

SakoBu

1,109317

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

1

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

|
show 1 more comment

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

1

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

But when i try to use it, i get an error like: TypeError: (0, _reducer.makeRouteReducer) is not a function. (In '(0, _reducer.makeRouteReducer)()', '(0, _reducer.makeRouteReducer)' is undefi ned)

– Nguyễn Văn Đại
Nov 13 '18 at 4:05

What is the error?

– SakoBu
Nov 13 '18 at 4:05

(0, _reducer.makeRouteReducer) is not a function

– Nguyễn Văn Đại
Nov 13 '18 at 4:06

Oh there is a typo in your code... makeRootReducer and makeRouteReducer... @NguyễnVănĐại

– SakoBu
Nov 13 '18 at 4:15

This is my app repo after i changed it by following your recommendation, but it still don't work: github.com/daihalu/Booking-Car.git

– Nguyễn Văn Đại
Nov 13 '18 at 4:32

|
show 1 more comment

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