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+# React.memo and useMemo
+
+## React.memo
+
+`React.memo` is a higher-order component (HOC) that optimizes the performance of functional components by preventing unnecessary re-renders. It works by memoizing the component and only re-renders it when its props change.
+
+### Why Use `React.memo`?
+
+In React, when a parent component re-renders, all its child components also re-render by default, even if their props haven't changed. This can lead to performance issues in large applications or components that are expensive to re-render.
+
+`React.memo` prevents these unnecessary re-renders by memoizing the component and only allowing it to re-render when its props actually change.
+
+### Example Without `React.memo`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+interface MyComponentProps {
+  name: string;
+}
+
+const MyComponent: React.FC<MyComponentProps> = ({ name }) => {
+  console.log('Component rendered');
+  return <div>Hello, {name}!</div>;
+};
+
+const ParentComponent: React.FC = () => {
+  const [count, setCount] = React.useState<number>(0);
+
+  return (
+    <div>
+      <button onClick={() => setCount(count + 1)}>Increment</button>
+      <MyComponent name="John" />
+    </div>
+  );
+};
+
+export default ParentComponent;
+```
+
+In this example, every time the button is clicked and the `count` state changes, `MyComponent` re-renders even though its `name` prop hasn't changed.
+
+### Example With `React.memo`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+interface MyComponentProps {
+  name: string;
+}
+
+const MyComponent: React.FC<MyComponentProps> = React.memo(({ name }) => {
+  console.log('Component rendered');
+  return <div>Hello, {name}!</div>;
+});
+
+const ParentComponent: React.FC = () => {
+  const [count, setCount] = React.useState<number>(0);
+
+  return (
+    <div>
+      <button onClick={() => setCount(count + 1)}>Increment</button>
+      <MyComponent name="John" />
+    </div>
+  );
+};
+
+export default ParentComponent;
+
+```
+
+By using `React.memo`, `MyComponent` only re-renders if its `name` prop changes, improving performance by avoiding unnecessary re-renders.
+
+## How `React.memo` Works
+
+`React.memo` performs a shallow comparison of the component's props. If the props are the same as the previous render, the component will not re-render.
+
+Primitives (numbers, strings, booleans) are compared by value.
+Objects, arrays, and functions are compared by reference.
+Custom Comparison Function
+If you need more control over how the props are compared, you can pass a custom comparison function as the second argument to `React.memo`.
+
+### Example With `Custom Comparison`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+interface MyComponentProps {
+  name: string;
+  info: {
+    age: number;
+  };
+}
+
+const MyComponent: React.FC<MyComponentProps> = React.memo(
+  ({ name, info }) => {
+    console.log('Component rendered');
+    return (
+      <div>
+        <p>Hello, {name}!</p>
+        <p>Age: {info.age}</p>
+      </div>
+    );
+  },
+  (prevProps, nextProps) => {
+    return prevProps.name === nextProps.name && prevProps.info.age === nextProps.info.age;
+  }
+);
+
+const ParentComponent: React.FC = () => {
+  const [count, setCount] = React.useState<number>(0);
+  const info = { age: 25 };
+
+  return (
+    <div>
+      <button onClick={() => setCount(count + 1)}>Increment</button>
+      <MyComponent name="John" info={info} />
+    </div>
+  );
+};
+
+export default ParentComponent;
+```
+
+Here, the custom comparison function ensures `MyComponent` only re-renders when the `name` or `info.age` changes.
+
+## useMemo
+
+`useMemo` is a React hook that optimizes performance by memoizing the result of a calculation or a function call. It recomputes the value only when one of its dependencies changes.
+
+### Why Use useMemo?
+
+Without `useMemo`, expensive calculations inside a component will be recalculated every time the component renders, even if the inputs to the calculation haven't changed. This can lead to performance issues.
+
+By using `useMemo`, you can memoize the result of the calculation and avoid unnecessary recalculations.
+
+### Example Without `useMemo`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+const calculateValue = (num: number): number => {
+  console.log('Expensive calculation');
+  return num * 2;
+};
+
+interface MyComponentProps {
+  num: number;
+}
+
+const MyComponent: React.FC<MyComponentProps> = ({ num }) => {
+  const value = calculateValue(num);
+
+  return <div>Value: {value}</div>;
+};
+
+const ParentComponent: React.FC = () => {
+  const [count, setCount] = React.useState<number>(0);
+
+  return (
+    <div>
+      <button onClick={() => setCount(count + 1)}>Increment</button>
+      <MyComponent num={5} />
+    </div>
+  );
+};
+
+export default ParentComponent;
+```
+
+In this example, `calculateValue` is called every time `ParentComponent` renders, even though `num` remains the same.
+
+### Example Without `useMemo`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+const calculateValue = (num: number): number => {
+  console.log('Expensive calculation');
+  return num * 2;
+};
+
+interface MyComponentProps {
+  num: number;
+}
+
+const MyComponent: React.FC<MyComponentProps> = ({ num }) => {
+  const value = React.useMemo(() => calculateValue(num), [num]);
+
+  return <div>Value: {value}</div>;
+};
+
+const ParentComponent: React.FC = () => {
+  const [count, setCount] = React.useState<number>(0);
+
+  return (
+    <div>
+      <button onClick={() => setCount(count + 1)}>Increment</button>
+      <MyComponent num={5} />
+    </div>
+  );
+};
+
+export default ParentComponent;
+```
+
+In this example, `calculateValue` is only called when `num` changes, thanks to `useMemo`.
+
+## How useMemo Works
+
+useMemo memoizes the result of the function passed to it. It takes two arguments:
+
+1. A function that returns the value you want to memoize.
+2. A dependency array. The function is only recomputed when one of the dependencies changes.
+
+### Example With `Dependency Array`
+
+`typescript`
+
+```bash
+import React from 'react';
+
+const calculateValue = (num: number, multiplier: number): number => {
+  console.log('Expensive calculation');
+  return num * multiplier;
+};
+
+const MyComponent: React.FC = () => {
+  const [num, setNum] = React.useState<number>(5);
+  const [multiplier, setMultiplier] = React.useState<number>(2);
+
+  const value = React.useMemo(() => calculateValue(num, multiplier), [num, multiplier]);
+
+  return (
+    <div>
+      <button onClick={() => setNum(num + 1)}>Increment Num</button>
+      <button onClick={() => setMultiplier(multiplier + 1)}>Increment Multiplier</button>
+      <div>Value: {value}</div>
+    </div>
+  );
+};
+
+export default MyComponent;
+```
+
+In this example, `calculateValue` is only called when either `num` or `multiplier changes`.
+
+## Conclusion
+
+Both `React.memo` and `useMemo` are useful performance optimization tools in React.
+
+- Use `React.memo` to prevent unnecessary re-renders of child components by memoizing them.
+- Use useMemo to memoize expensive calculations or function results to avoid recalculating on every render.
+
+## References
+
+- React.memo Documentation (https://reactjs.org/docs/react-api.html#reactmemo)
+- useMemo Documentation (https://reactjs.org/docs/hooks-reference.html#usememo)
+
+## Additional Resources
+
+### Medium Articles:
+
+- Memoization in React (https://medium.com/@rumeysakaragoz18/memoization-in-react-memo-usecallback-and-usememo-69b1367041e0)
+- React Performance Optimization using React.memo or useMemo (https://medium.com/@arunsheoran90/react-performance-optimisation-using-react-memo-usememo-6edcb25a1ed6)
+
+### Walkthrough Videos:
+
+- Learn useMemo and React Memo for Faster Apps: (https://www.youtube.com/watch?v=6-BfMpTT2PE​).
+
+- useMemo Explained | React Hooks useMemo Tutorial: (https://www.youtube.com/watch?v=oR8gUi1LfWY​)
+
+- Mastering React Memo:( https://www.youtube.com/watch?v=DEPwA3mv_R8)
+
+- Learn useMemo In 15 Minutes - React Hooks Explained: (https://www.youtube.com/watch?v=JvdxYsF66K4​)
+
+- React.memo, useMemo, and useCallback Optimizations: (https://www.youtube.com/watch?v=4BranN3qnDU​)