AG-1053 Tidy react examples, make more idiomatic

src-examples/dynamicComponentExample/SquareRenderer.jsx

@@ -0,0 +1,21 @@
+import React, {Component} from "react";
+
+export default class SquareRenderer extends Component {
+    constructor(props) {
+        super(props);
+
+        this.state = {
+            value: this.valueSquared()
+        };
+    }
+
+    valueSquared() {
+        return this.props.value * this.props.value;
+    }
+
+    render() {
+        return (
+            <span>{this.state.value}</span>
+        );
+    }
+};