App.js

import { StatusBar } from 'expo-status-bar';
import React, { useState } from 'react';
import { StyleSheet, View, FlatList, Button } from 'react-native';
import GoalItem from './components/GoalItem';
import GoalInput from './components/GoalInput';

export default function App() {
  const [lifeGoals, setLifeGoals] = useState([]);
  const [isAddMode, setIsAddMode] = useState(false);

  const addGoalHandler = (goalTitle) => {
    setLifeGoals(currentGoals => [...currentGoals, {id: Math.random().toString(), value: goalTitle}]);
    setIsAddMode(false);
  };

  const removeGoalHandler = goalId => {
    setLifeGoals(currentGoals => {
      return currentGoals.filter((goal) => goal.id !== goalId);
    });
  };

  const cancelGoalAdditionHandler = () => {
    setIsAddMode(false);
  };
  return (
    <View style={styles.screen}>
      <Button title="Add New Goal" onPress={() => setIsAddMode(true)}/>
      <GoalInput visible={isAddMode} onAddGoal={addGoalHandler} onCancel={cancelGoalAdditionHandler} />
      <FlatList keyExtractor={(item, index) => item.id} data={lifeGoals} renderItem={itemData => (
        <GoalItem id={itemData.item.id} onDelete= {removeGoalHandler} title={itemData.item.value}/>
      )} />
    </View>
  );
};

const styles = StyleSheet.create({
  screen: {
    padding: 50
  }
});