Advanced Tutorials

Master complex UI patterns, optimization strategies, and advanced component techniques.

Interactive Example

Custom Hook Implementation

Custom Hooks

UseCase: useFormValidator


const useFormValidator = () => {
  const [errors, setErrors] = useState({});

  const validate = (field, value) => {
    let error = '';
    if (field === 'email' && !/\S+@\S+\.\S/.test(value)) {
      error = 'Invalid email address';
    }
    setErrors(prev => ({ ...prev, [field]: error }));
    return error;
  };

  return { validate, errors };
};

Create reusable validation logic across form components with this custom hook pattern.

Performance Optimization

Memoization with useMemo()


const expensiveCalculate = (a, b) => {
  // complex calculation that could benefit from memoization
  return Math.sinh(a * b) / Math.cosh(a + b);
};

const useCalculations = (a, b) => {
  return useMemo(() => {
    return expensiveCalculate(a, b);
  }, [a, b]);
};

Avoid redundant computations by memoizing expensive operations between renders.

React Profiling


import React from 'react';

function MyComponent({ data }) {
  React.useMemo(() => {
    if (process.env.NODE_ENV !== 'production') {
      console.profile('Rendering MyComponent', true);
      console.profileEnd();
    }
    return {data};
  }, [data]);
}

Use the React Profiler API to track performance bottlenecks in development mode.

State Management Patterns

Redux Toolkit Example

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

export const userSlice = createSlice({
    name: 'user',
    initialState: { name: '', email: '' },
    reducers: {
        login: (state, action) => {
            return { ...state, ...action.payload };
        },
        logout: (state) => {
            return { name: '', email: '' };
        },
    }
});

Use Redux Toolkit for efficient state management with immutable updates.