component: improve the performance by using shouldComponentUpdate() lifecycle

src/components/Layout/Layout.js

@@ -26,7 +26,7 @@ class Layout extends Component {
                 <Toolbar drawerToggleClicked={this.sideDrawerToggleHandler} />
                 <SideDrawer open={this.state.showSideDrawer} closed={this.sideDrawerClosedHandler} />
                 <main className={classes.Content}>
-                    {this.state.children}
+                    {this.props.children}
                 </main>
             </Aux>
 

src/components/UI/Modal/Modal.js

@@ -1,26 +1,32 @@
-import React from 'react';
+import React, { Component } from 'react';
 
 import Aux from '../../../hoc/Auxiliary';
 import Backdrop from '../Backdrop/Backdrop';
 import classes from './Modal.css';
 
-const modal = (props) => {
-    return (
-        <Aux>
-            <Backdrop
-                show={props.show}
-                clicked={props.modalClosed}></Backdrop>
-            <div
-                className={classes.Modal}
-                style={{
-                    transform: props.show ? 'translateY(0)' : 'translateY(-100vh)',
-                    opacity: props.show ? '1' : '0',
-                }}>
-                {props.children}
-            </div>
+class Modal extends Component {
 
-        </Aux>
-    );
-};
+    shouldComponentUpdate(nextProps, nextState){
+        return nextProps.show !== this.props.show;
+    }
 
-export default modal;
+    render() {
+        return (
+            <Aux>
+                <Backdrop
+                    show={this.props.show}
+                    clicked={this.props.modalClosed}></Backdrop>
+                <div
+                    className={classes.Modal}
+                    style={{
+                        transform: this.props.show ? 'translateY(0)' : 'translateY(-100vh)',
+                        opacity: this.props.show ? '1' : '0',
+                    }}>
+                    {this.props.children}
+                </div>
+            </Aux>
+        );
+    }
+}
+
+export default Modal;