Converting class component to function component

src/GuessControl.js

@@ -1,7 +1,7 @@
-import React, { Component } from "react";
+import React, { Component, useState } from "react";
 import Button from "./Button";
 
-class GuessControl extends Component {
+class GuessControlOld extends Component {
   constructor(props) {
     super(props);
 
@@ -44,4 +44,25 @@ class GuessControl extends Component {
   }
 }
 
+const GuessControl = ({ onGuess }) => {
+  const [currentGuess, setCurrentGuess] = useState(0);
+
+  const handleInputChange = (event) => {
+    const updatedValue = event.target.value;
+    setCurrentGuess(updatedValue);
+  };
+
+  const onSubmitGuess = () => {
+    onGuess(Number(currentGuess));
+    setCurrentGuess("");
+  };
+
+  return (
+    <div>
+      <input type="number" value={currentGuess} onChange={handleInputChange} />
+      <Button onClick={onSubmitGuess}>Submit Guess</Button>
+    </div>
+  );
+};
+
 export default GuessControl;

src/NumberGuessingGame.js

@@ -1,4 +1,4 @@
-import React, { Component } from "react";
+import React, { useState } from "react";
 import GuessControl from "./GuessControl";
 import GuessMessage from "./GuessMessage";
 import GameOver from "./GameOver";
@@ -13,65 +13,42 @@ 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);
-  }
-
-  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>
-    );
-  }
-}
+const NumberGuessingGame = () => {
+  const [numberToGuess, setNumberToGuess] = useState(getRandomNumber());
+  const [numberOfGuesses, setNumberOfGuesses] = useState(0);
+  const [latestGuess, setLatestGuess] = useState(0);
+
+  const isCorrectGuess = latestGuess === numberToGuess ? true : false;
+
+  const isGameOver = isCorrectGuess || numberOfGuesses === MAX_ATTEMPTS;
+
+  const handleGuess = (guess) => {
+    setLatestGuess(Number(guess));
+    setNumberOfGuesses((prevGuss) => prevGuss + 1);
+  };
+
+  const handleReset = () => {
+    setLatestGuess(null);
+    setNumberOfGuesses(0);
+  };
+
+  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>
+  );
+};
 
 export default NumberGuessingGame;