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Pending Action

Pending Action sits at the heart of createasyncthunk in Redux. This guide walks through the concept step by step, with examples, a cheatsheet, and common mistakes to avoid.

Pending Action Overview

At its core, pending action is about doing one thing well in Redux. Once you understand the pattern, you can apply it consistently across projects and teams.

Good pending action pays off across the whole project: fewer surprises, easier collaboration, and smoother onboarding. The snippet below is a solid starting point.

import { createSlice } from '@reduxjs/toolkit';

const counterSlice = createSlice({
  name: 'counter',
  initialState: { value: 0 },
  reducers: {
    increment: (state) => { state.value += 1; },
    addBy: (state, action) => { state.value += action.payload; },
  },
});

export const { increment, addBy } = counterSlice.actions;
export default counterSlice.reducer;

createSlice generates actions and a reducer together; Immer lets you write safe 'mutating' updates.

Pending Action Example

const slice = createSlice({ name, initialState, reducers });
const store = configureStore({ reducer: { key: slice.reducer } });
// dispatch(slice.actions.something())
  • Start from a minimal Pending Action example and grow it only as needed.
  • Keep things explicit so Pending Action behaves the same for everyone on the team.
  • Name things clearly so teammates understand your Pending Action at a glance.
  • Verify Pending Action works as expected before relying on it in important work.

Redux Cheatsheet

Quick Redux Toolkit reference related to pending action.

Concept Example Purpose
Store configureStore({ reducer }) Hold app state
Slice createSlice({ name, reducers }) State + actions together
Read state useSelector((s) => s.x) Get data in components
Dispatch useDispatch() Send actions
Async createAsyncThunk(...) Handle side effects
Data fetching createApi(...) RTK Query endpoints
Derived data createSelector(...) Memoized computations

How Pending Action Works in Redux

Pending Action follows Redux's predictable data flow: components dispatch actions, reducers compute the next state from the previous state and the action, and subscribed components re-render.

createSlice generates actions and a reducer together; Immer lets you write safe 'mutating' updates.

  • State lives in a single, read-only store.
  • Actions are the only way to describe a change.
  • Reducers are pure functions that return the next state.
  • Redux Toolkit removes most boilerplate with slices and thunks.

Practical Guidance for Pending Action

In modern apps, pending action should use Redux Toolkit rather than hand-written Redux. Keep state minimal, colocate logic in slices, and use RTK Query for server data.

Concern Recommendation
Boilerplate Use Redux Toolkit (createSlice)
Server data Prefer RTK Query over manual thunks
Performance Memoize selectors with createSelector
Types Use typed useAppSelector/useAppDispatch hooks

Common Mistakes

  • Skipping edge cases and error handling when using pending action.
  • Not verifying the result of pending action before moving on.
  • Over-complicating pending action before you actually need the extra flexibility.
  • Ignoring documentation, which makes pending action hard for the next person to follow.

Key Takeaways

  • Pending Action is a core part of working effectively with Redux.
  • Start small and keep pending action focused on a single goal.
  • Apply consistent patterns so pending action scales across your project.
  • Practise and document pending action to keep your workflow maintainable.

Pro Tip

Bookmark this pending action pattern and reuse it. Consistency across your Redux work is worth more than clever one-off solutions.