Lesson_2_1 React Router Class Components

src/Button.jsx

@@ -4,6 +4,7 @@ const buttonStyle = {
   minHeight: "2em",
 };
 
+// eslint-disable-next-line react/prop-types
 export default function Button({ onClick, children }) {
   return (
     <button style={buttonStyle} onClick={onClick}>

src/GameOver.jsx

@@ -1,10 +1,12 @@
 import Button from "./Button";
 
+// eslint-disable-next-line react/prop-types
 function GameOver({ hasWon, onReset }) {
   return (
     <div>
       {hasWon && <h2>Congratulation! You guessed my number.</h2>}
       {!hasWon && (
+        // eslint-disable-next-line react/no-unescaped-entities
         <h2>You didn't guess my number. Would you like to try again?</h2>
       )}
       <Button onClick={onReset}>Play Again!</Button>

src/GuessControl.jsx

@@ -1,47 +1,73 @@
-import React, { Component } from "react";
+import { useState } from "react";
 import Button from "./Button";
+import PropTypes from "prop-types";
 
-class GuessControl extends Component {
-  constructor(props) {
-    super(props);
+function GuessControl(props) {
+  const [currentGuess, setCurrentGuess] = useState("");
 
-    this.state = {
-      currentGuess: "",
-    };
-
-    /**
-     * These lines are required to make the methods/functions declared on this
-     *  class have the correct `this` object when they run.
-     */
-    this.handleInputChange = this.handleInputChange.bind(this);
-    this.onSubmitGuess = this.onSubmitGuess.bind(this);
-  }
-
-  handleInputChange(event) {
-    this.setState({ currentGuess: event.target.value });
+  function handleInputChange(event) {
+    setCurrentGuess(event.target.value);
   }
 
-  onSubmitGuess() {
-    // Since the values from an HTML input are strings by default,
-    //  convert to a number for the returned guess value
-    //  by passing in the string to the Number function.
-    // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
-    this.props.onGuess(Number(this.state.currentGuess));
-    this.setState({ currentGuess: "" });
+  function onSubmitGuess() {
+    props.onGuess(Number(currentGuess));
+    setCurrentGuess("");
   }
 
-  render() {
-    return (
-      <div>
-        <input
-          type="number"
-          value={this.state.currentGuess}
-          onChange={this.handleInputChange}
-        />
-        <Button onClick={this.onSubmitGuess}>Submit Guess</Button>
-      </div>
-    );
-  }
+  return (
+    <div>
+      <input type="number" value={currentGuess} onChange={handleInputChange} />
+      <Button onClick={onSubmitGuess}>Submit Guess</Button>
+    </div>
+  );
 }
 
+GuessControl.propTypes = {
+  onGuess: PropTypes.func.isRequired,
+};
+
+// class GuessControlOld extends Component {
+//   constructor(props) {
+//     super(props);
+
+//     this.state = {
+//       currentGuess: "",
+//     };
+
+//     /**
+//      * These lines are required to make the methods/functions declared on this
+//      *  class have the correct `this` object when they run.
+//      */
+//     this.handleInputChange = this.handleInputChange.bind(this);
+//     this.onSubmitGuess = this.onSubmitGuess.bind(this);
+//   }
+
+//   handleInputChange(event) {
+//     this.setState({ currentGuess: event.target.value });
+//   }
+
+//   onSubmitGuess() {
+//     // Since the values from an HTML input are strings by default,
+//     //  convert to a number for the returned guess value
+//     //  by passing in the string to the Number function.
+//     // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number
+//     this.props.onGuess(Number(this.state.currentGuess));
+//     this.setState({ currentGuess: "" });
+//   }
+
+//   render() {
+//     return (
+//       <div>
+//         <input
+//           type="number"
+//           value={this.state.currentGuess}
+//           onChange={this.handleInputChange}
+//         />
+//         <Button onClick={this.onSubmitGuess}>Submit Guess</Button>
+//       </div>
+//     );
+//   }
+// }
+
 export default GuessControl;
+

src/NumberGuessingGame.jsx

@@ -1,4 +1,6 @@
-import React, { Component } from "react";
+/* eslint-disable react/no-unescaped-entities */
+// import React,
+import { useState } from "react";
 import GuessControl from "./GuessControl";
 import GuessMessage from "./GuessMessage";
 import GameOver from "./GameOver";
@@ -13,65 +15,103 @@ function getRandomNumber() {
 
 const MAX_ATTEMPTS = 5;
 
-class NumberGuessingGame extends Component {
-  constructor(props) {
-    super(props);
-
-    this.state = {
-      numberToGuess: getRandomNumber(),
-      numberOfGuesses: 0,
-      latestGuess: null,
-    };
-
-    /**
-     * These lines are required to make the methods/functions declared on this
-     *  class have the correct `this` object when they run.
-     */
-    this.handleGuess = this.handleGuess.bind(this);
-    this.handleReset = this.handleReset.bind(this);
-  }
+function NumberGuessingGame() {
+  const [numberToGuess, setNumberToGuess] = useState(getRandomNumber);
+  const [numberOfGuesses, setNumberOfGuesses] = useState(0);
+  const [latestGuess, setLatestGuess] = useState(null);
 
-  handleGuess(guess) {
-    this.setState({
-      latestGuess: guess,
-      numberOfGuesses: this.state.numberOfGuesses + 1,
-    });
+  function handleGuess(guess) {
+    setLatestGuess(Number(guess));
+    setNumberOfGuesses(numberOfGuesses + 1);
   }
 
-  handleReset() {
-    this.setState({
-      numberToGuess: getRandomNumber(),
-      numberOfGuesses: 0,
-      latestGuess: null,
-    });
+  function handleReset() {
+    setNumberToGuess(getRandomNumber());
+    setNumberOfGuesses(0);
+    setLatestGuess(null);
   }
 
-  render() {
-    const isCorrectGuess = this.state.latestGuess === this.state.numberToGuess;
-
-    const isGameOver =
-      isCorrectGuess || this.state.numberOfGuesses === MAX_ATTEMPTS;
-
-    return (
-      <div>
-        <h2>I'm thinking of a number from 1 to 100.</h2>
-        <h2>
-          Can you guess the number I am thinking of in {MAX_ATTEMPTS} tries?
-        </h2>
-        <GuessControl onGuess={this.handleGuess} />
-        {isGameOver && (
-          <GameOver hasWon={isCorrectGuess} onReset={this.handleReset} />
-        )}
-        {!isGameOver && (
-          <GuessMessage
-            guess={this.state.latestGuess}
-            numberToGuess={this.state.numberToGuess}
-            numberOfGuesses={this.state.numberOfGuesses}
-          />
-        )}
-      </div>
-    );
-  }
+  const isCorrectGuess = latestGuess === numberToGuess;
+  const isGameOver = isCorrectGuess || numberOfGuesses === MAX_ATTEMPTS;
+
+  return (
+    <div>
+      <h2>I'm thinking of a number from 1 to 100.</h2>
+      <h2>
+        Can you guess the number I am thinking of in {MAX_ATTEMPTS} tries?
+      </h2>
+      <GuessControl onGuess={handleGuess} />
+      {isGameOver && <GameOver hasWon={isCorrectGuess} onReset={handleReset} />}
+      {!isGameOver && (
+        <GuessMessage
+          guess={latestGuess}
+          numberToGuess={numberToGuess}
+          numberOfGuesses={numberOfGuesses}
+        />
+      )}
+    </div>
+  );
 }
 
+// class NumberGuessingGameOld extends Component {
+//   constructor(props) {
+//     super(props);
+
+//     this.state = {
+//       numberToGuess: getRandomNumber(),
+//       numberOfGuesses: 0,
+//       latestGuess: null,
+//     };
+
+/**
+ * These lines are required to make the methods/functions declared on this
+ *  class have the correct `this` object when they run.
+ */
+//   this.handleGuess = this.handleGuess.bind(this);
+//   this.handleReset = this.handleReset.bind(this);
+// }
+
+// handleGuess(guess) {
+//   this.setState({
+//     latestGuess: guess,
+//     numberOfGuesses: this.state.numberOfGuesses + 1,
+//   });
+// }
+
+// handleReset() {
+//   this.setState({
+//     numberToGuess: getRandomNumber(),
+//     numberOfGuesses: 0,
+//     latestGuess: null,
+//   });
+// }
+
+// render() {
+// const isCorrectGuess = this.state.latestGuess === this.state.numberToGuess;
+
+// const isGameOver =
+//   isCorrectGuess || this.state.numberOfGuesses === MAX_ATTEMPTS;
+
+//     return (
+//       <div>
+//         <h2>I'm thinking of a number from 1 to 100.</h2>
+//         <h2>
+//           Can you guess the number I am thinking of in {MAX_ATTEMPTS} tries?
+//         </h2>
+//         <GuessControl onGuess={this.handleGuess} />
+//         {isGameOver && (
+//           <GameOver hasWon={isCorrectGuess} onReset={this.handleReset} />
+//         )}
+//         {!isGameOver && (
+//           <GuessMessage
+//             guess={this.state.latestGuess}
+//             numberToGuess={this.state.numberToGuess}
+//             numberOfGuesses={this.state.numberOfGuesses}
+//           />
+//         )}
+//       </div>
+//     );
+//   }
+// }
+
 export default NumberGuessingGame;