revision new files

Chapter 14/exampled3.html

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+<!DOCTYPE html>
+<html>
+<head>
+    <script src="https://d3js.org/d3.v7.min.js"></script>
+    <style>
+        svg {
+            background-color: lightgrey;
+        }
+    </style>
+</head>
+<body>
+    <svg id="drawing-area" height=100 width=500></svg>
+    <script>
+        let svg = d3.select("#drawing-area");
+        svg.append("circle")
+            .attr("cx", 100).attr("cy", 50).attr("r", 20).style("fill", "pink");
+        svg.append("circle")
+            .attr("cx", 200).attr("cy", 20).attr("r", 20).style("fill", "black");
+        svg.append("circle")
+            .attr("cx", 300).attr("cy", 70).attr("r", 20).style("fill", "grey");
+    </script>
+</body>
+
+</html>

Chapter 14/examplereact.html

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+<!DOCTYPE html>
+<html>
+
+<head>
+    <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script>
+    <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script>
+</head>
+
+<body>
+    <div id="root"></div>
+    <script>
+        let p = React.createElement("p", null, "Hi Emile, what's up?");
+        ReactDOM.render(
+            p,
+            document.getElementById("root")
+        );
+    </script>
+</body>
+
+</html>

Chapter 14/exampleunderscore.html

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+<!DOCTYPE html>
+<html>
+
+<head>
+    <script src="https://cdn.jsdelivr.net/npm/underscore@1.13.1/underscore-umd-min.js
+    "></script>
+</head>
+
+<body>
+    <script>
+        _.each([1, 2, 3], alert);
+    </script>
+</body>
+
+</html>