Mujie Shen Friday 6:30pm

src/components/BoardSwitcher.jsx

@@ -1,4 +1,4 @@
-import React from "react";
+import React, { useState } from "react";
 
 function Board(props) {
   let className = "board";
@@ -10,16 +10,24 @@ function Board(props) {
 }
 
 function BoardSwitcher(props) {
+  // add state to track current selection
+  // state variable
+  const [selectedBoardIndex, setSelectedBoardIndex] = useState(0);
+  // create an event handler
+  const handleClick = (event) => {
+    // use the getter when trying to update the setter of state variable 
+    setSelectedBoardIndex((selectedBoardIndex + 1) % props.numBoards);
+  }
   let boards = [];
-  for (let ii = 0; ii < props.numBoards; ii++) {
-    let isSelected = ii === 0;
-    boards.push(<Board index={ii} selected={isSelected} key={ii} />);
+  for (let boardIndex = 0; boardIndex < props.numBoards; boardIndex++) {
+    let isSelected = boardIndex === selectedBoardIndex;
+    boards.push(<Board index={boardIndex} selected={isSelected} key={boardIndex} />);
   }
 
   return (
     <div>
       <div className="boards">{boards}</div>
-      <button>Toggle</button>
+      <button onClick={handleClick}>Toggle</button>
     </div>
   );
 }

src/main.jsx

@@ -6,6 +6,6 @@ import "./index.css";
 const root = ReactDOM.createRoot(document.getElementById("root"));
 root.render(
   <React.StrictMode>
-    <BoardSwitcher numBoards={3} />
+    <BoardSwitcher numBoards={5} />
   </React.StrictMode>
 );