Currying

test.js

import _get from "lodash/get";
import _merge from "lodash/merge";
import _isEqual from "lodash/isEqual";

const not = (fun) => (...args) => !fun(...args);
const and = (fun1, fun2) => (...args) => fun1(...args) && fun2(...args);

const isSaving = (savingStatePath) => (state) => {
    const savingState = _get(state, savingStatePath, false);
    return savingState && savingState.state === "SAVING";
}

const hasUnsavedFields = (modelPath, editedFieldsPath)  => (state) => {
    const originalModel = _get(state, modelPath, {});
    const editedFields = _get(state, editedFieldsPath, {});
    const editedModel = _merge({}, originalModel, editedFields);
    return !_isEqual(originalModel, editedModel);
};

const canNavigateOut = {
    "show_edit": and(
        not(isSaving("show.show_edit_save_state")),
        not(hasUnsavedFields("show.show.model","show.show_edit"))
    ),
    "another_route": not(
        isSaving("settings.settings_save_state")
    )
} 

//Dynamically select logic from current route
canNavigateOut[currentRoute](state);