javascript - Redux reducer not updating state object -

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i have following code, , trying update state not working.

import immutable 'immutable'; import _un  'underscore'; import { list, map } 'immutable';   const defaultstate = map({   isfetching:true,   deparments: list(),   products:list(),   breadcrumb:list() })

i using set when console before return prints original object. doing wrong?

switch(action.type) {      case 'get_gallery_data':        //console.log("-- api success handler--");       //console.log(action);         var depts = getgalleryparseddata(action.res.data);        var products = getproducts(action.res.data);        var breadcrumb = getbreadcrumbs(action.res.data);        state.set('isfetching', true);       state.set('deparments', list(depts))       state.set('products', list(products))       //state.set('breadcrumb', list(breadcrumb))       console.log("---state----");      console.log(state);       return state;

immutable.js not mutate state, returns mutated copy of original object.

state = state.set('isfetching', true); state = state.set('deparments', list(depts)); state = state.set('products', list(products));

or

state = state   .set('isfetching', true)   .set('deparments', list(depts))   .set('products', list(products));

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