Javascirpt return

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My JavaScript</title>
</head>
<body>
  <script src="main.js"></script>
</body>
</html>

main.js

'use strict';

{
  function calcurateTotal(price, amount, rate = 1.1) {
    // if (amount >= 100) {
    //   return price * amount;
    // } else {
    //   return price * amount * rate;
    // }

    if (amount >= 100) {
      // 早期リターン
      return price * amount;
    }
    return price * amount * rate;
  }

  console.log(calcurateTotal(100, 100));
  console.log(calcurateTotal(1000, 10));
}

Javascript 引数にデフォルト値を設定

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My JavaScript</title>
</head>
<body>
  <script src="main.js"></script>
</body>
</html>

main.js

'use strict';

{
    function calculateTotal(price, amount, rate = 1.1)
    {
        return price * amount * rate;
    }

    console.log(calculateTotal(100, 10));
    console.log(calculateTotal(100, 10));
    console.log(calculateTotal(100, 10));
    console.log(calculateTotal(100, 10, 1, 1.08));
}

Javascirpt 関数

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My JavaScript</title>
</head>
<body>
  <script src="main.js"></script>
</body>
</html>

main.js

'use strict';

{
  function double(num) { // 仮引数
    return num * 2;
  }

  console.log(double(10)); // 実引数
  console.log(double(4) * 3); // 実引数
}

python GPT-2

from transformers import GPT2LMHeadModel, GPT2Tokenizer

def generate_text(prompt, max_length=100):
    tokenizer = GPT2Tokenizer.from_pretrained("gpt2")
    model = GPT2LMHeadModel.from_pretrained("gpt2")

    inputs = tokenizer.encode(prompt, return_tensors='pt')
    outputs = model.generate(inputs, max_length=max_length, num_return_sequences=1)
    return tokenizer.decode(outputs[0], skip_special_tokens=True)

prompt = "こんにちは"
generated_text = generate_text(prompt)
print(generated_text)

Javascirpt カレンダー

<!DOCTYPE html>style.css
<html lang="ja">
<head>
  <meta charset="utf-8">
  <title>Calendar</title>
  <link rel="stylesheet" href="css/styles.css">
</head>
<body>
  <table>
    <thead>
      <tr>
        <th id="prev">«</th>
        <th id="title" colspan="5">2020/05</th>
        <th id="next">»</th>
      </tr>
      <tr>
        <th>Sun</th>
        <th>Mon</th>
        <th>Tue</th>
        <th>Wed</th>
        <th>Thu</th>
        <th>Fri</th>
        <th>Sat</th>
      </tr>
    </thead>
    <tbody>
    </tbody>
    <tfoot>
      <tr>
        <td id="today" colspan="7">Today</td>
      </tr>
    </tfoot>
  </table>

  <script src="js/main.js"></script>
</body>
</html>

style.css

body {
  font-family: 'Courier New', monospace;
  font-size: 14px;
}

table {
  border-collapse: collapse;
  border: 2px solid #eee;
}

thead,
tfoot {
  background: #eee;
}

th,
td {
  padding: 8px;
  text-align: center;
}

tbody td:first-child {
  color: red;
}

tbody td:last-child {
  color: blue;
}

tfoot {
  font-weight: bold;
}

td.disabled {
  opacity: 0.3;
}

td.today {
  font-weight: bold;
}

#prev,
#next,
#today {
  cursor: pointer;
  user-select: none;
}
'use strict';

console.clear();

{
  const today = new Date();
  let year = today.getFullYear();
  let month = today.getMonth();

  function getCalendarHead() {
    const dates = [];
    const d = new Date(year, month, 0).getDate();
    const n = new Date(year, month, 1).getDay();

    for (let i = 0; i < n; i++) {
      // 30
      // 29, 30
      // 28, 29, 30
      dates.unshift({
        date: d - i,
        isToday: false,
        isDisabled: true,
      });
    }

    return dates;
  }

  function getCalendarBody() {
    const dates = []; // date: 日付, day: 曜日
    const lastDate = new Date(year, month + 1, 0).getDate();

    for (let i = 1; i <= lastDate; i++) {
      dates.push({
        date: i,
        isToday: false,
        isDisabled: false,
      });
    }

    if (year === today.getFullYear() && month === today.getMonth()) {
      dates[today.getDate() - 1].isToday = true;
    }

    return dates;
  }

  function getCalendarTail() {
    const dates = [];
    const lastDay = new Date(year, month + 1, 0).getDay();

    for (let i = 1; i < 7 - lastDay; i++) {
      dates.push({
        date: i,
        isToday: false,
        isDisabled: true,
      });
    }

    return dates;
  }

  function clearCalendar() {
    const tbody = document.querySelector('tbody');

    while (tbody.firstChild) {
      tbody.removeChild(tbody.firstChild);
    }
  }

  function renderTitle() {
    const title = `${year}/${String(month + 1).padStart(2, '0')}`;
    document.getElementById('title').textContent = title;
  }

  function renderWeeks() {
    const dates = [
      ...getCalendarHead(),
      ...getCalendarBody(),
      ...getCalendarTail(),
    ];
    const weeks = [];
    const weeksCount = dates.length / 7;

    for (let i = 0; i < weeksCount; i++) {
      weeks.push(dates.splice(0, 7));
    }

    weeks.forEach(week => {
      const tr = document.createElement('tr');
      week.forEach(date => {
        const td = document.createElement('td');

        td.textContent = date.date;
        if (date.isToday) {
          td.classList.add('today');
        }
        if (date.isDisabled) {
          td.classList.add('disabled');
        }

        tr.appendChild(td);
      });
      document.querySelector('tbody').appendChild(tr);
    });
  }

  function createCalendar() {
    clearCalendar();
    renderTitle();
    renderWeeks();
  }

  document.getElementById('prev').addEventListener('click', () => {
    month--;
    if (month < 0) {
      year--;
      month = 11;
    }

    createCalendar();
  });

  document.getElementById('next').addEventListener('click', () => {
    month++;
    if (month > 11) {
      year++;
      month = 0;
    }

    createCalendar();
  });

  document.getElementById('today').addEventListener('click', () => {
    year = today.getFullYear();
    month = today.getMonth();

    createCalendar();
  });

  createCalendar();
}

python タスク

import os
import json
from datetime import datetime

class Task:
    def __init__(self, description, deadline=None, completed=False):
        self.description = description
        self.deadline = deadline
        self.completed = completed

    def to_dict(self):
        return {
            "description": self.description,
            "deadline": self.deadline.strftime("%Y-%m-%d %H:%M") if self.deadline else None,
            "completed": self.completed
        }

    @classmethod
    def from_dict(cls, task_dict):
        deadline_str = task_dict.get("deadline")
        deadline = datetime.strptime(deadline_str, "%Y-%m-%d %H:%M") if deadline_str else None
        return cls(task_dict["description"], deadline, task_dict["completed"])

class TaskList:
    def __init__(self, filename):
        self.filename = filename
        self.tasks = []
        self.load_tasks()

    def load_tasks(self):
        if os.path.exists(self.filename):
            with open(self.filename, 'r') as file:
                task_data = json.load(file)
                self.tasks = [Task.from_dict(task_dict) for task_dict in task_data]

    def save_tasks(self):
        with open(self.filename, 'w') as file:
            task_data = [task.to_dict() for task in self.tasks]
            json.dump(task_data, file, indent=4)

    def add_task(self, description, deadline_str=None):
        deadline = datetime.strptime(deadline_str, "%Y-%m-%d %H:%M") if deadline_str else None
        task = Task(description, deadline)
        self.tasks.append(task)
        self.save_tasks()
        print("タスクを追加しました")

    def edit_task(self, task_index, description=None, deadline_str=None):
        if 1 <= task_index <= len(self.tasks):
            task = self.tasks[task_index - 1]
            if description:
                task.description = description
            if deadline_str:
                task.deadline = datetime.strptime(deadline_str, "%Y-%m-%d %H:%M") if deadline_str else None
            self.save_tasks()
            print("タスクを編集しました")
        else:
            print("無効なタスク番号です")

    def display_tasks(self):
        if not self.tasks:
            print("タスクはありません")
        else:
            print("タスク一覧:")
            for i, task in enumerate(self.tasks, 1):
                status = "完了" if task.completed else "未完了"
                deadline = task.deadline.strftime("%Y-%m-%d %H:%M") if task.deadline else "なし"
                print(f"{i}. [{status}] {task.description} (締切: {deadline})")

    def mark_task_completed(self, task_index):
        if 1 <= task_index <= len(self.tasks):
            task = self.tasks[task_index - 1]
            task.completed = True
            self.save_tasks()
            print(f"タスク '{task.description}' を完了にしました")
        else:
            print("無効なタスク番号です")

    def delete_task(self, task_index):
        if 1 <= task_index <= len(self.tasks):
            deleted_task = self.tasks.pop(task_index - 1)
            self.save_tasks()
            print(f"タスク '{deleted_task.description}' を削除しました")
        else:
            print("無効なタスク番号です")

def main():
    filename = "tasks.json"
    task_list = TaskList(filename)

    while True:
        print("\n操作を選択してください:")
        print("1. タスクを追加")
        print("2. タスクを編集")
        print("3. タスク一覧を表示")
        print("4. タスクを完了にする")
        print("5. タスクを削除する")
        print("6. 終了")

        choice = input("選択 (1/2/3/4/5/6): ")

        if choice == '6':
            break
        elif choice == '1':
            description = input("新しいタスクの説明を入力してください: ")
            deadline_str = input("締切日時 (YYYY-MM-DD HH:MM) を入力してください (未入力可): ")
            task_list.add_task(description, deadline_str)
        elif choice == '2':
            task_list.display_tasks()
            task_index = int(input("編集するタスクの番号を入力してください: "))
            description = input("新しい説明を入力してください (未入力で変更なし): ")
            deadline_str = input("新しい締切日時 (YYYY-MM-DD HH:MM) を入力してください (未入力で変更なし): ")
            task_list.edit_task(task_index, description, deadline_str)
        elif choice == '3':
            task_list.display_tasks()
        elif choice == '4':
            task_list.display_tasks()
            task_index = int(input("完了にするタスクの番号を入力してください: "))
            task_list.mark_task_completed(task_index)
        elif choice == '5':
            task_list.display_tasks()
            task_index = int(input("削除するタスクの番号を入力してください: "))
            task_list.delete_task(task_index)
        else:
            print("無効な選択です")

if __name__ == "__main__":
    main()

python 検索エンジン

# データ
documents = [
    "Python is a popular programming language.",
    "It is known for its simplicity and readability.",
    "Python has a large community of developers.",
    "Python is widely used in web development."
]

# データの前処理
def preprocess(text):
    return text.lower()

# インデックスの作成
def create_index(documents):
    index = {}
    for doc_id, doc in enumerate(documents):
        doc = preprocess(doc)
        words = doc.split()
        for word in words:
            if word not in index:
                index[word] = []
            index[word].append(doc_id)
    return index

# クエリ処理
def search(query, index):
    query = preprocess(query)
    words = query.split()
    result = set(range(len(documents)))

    for word in words:
        if word in index:
            result &= set(index[word])

    return [documents[i] for i in result]

# メイン
if __name__ == "__main__":
    index = create_index(documents)

    while True:
        query = input("検索クエリを入力してください (終了するには 'exit' を入力): ")
        if query == 'exit':
            break
        results = search(query, index)
        if results:
            for i, result in enumerate(results, start=1):
                print(f"{i}. {result}")
        else:
            print("一致する文書はありません。")

python todoリスト

import os

# ファイル名
todo_filename = 'todo.txt'

# TODOリストを表示する関数
def show_todo_list():
    if os.path.exists(todo_filename):
        with open(todo_filename, 'r') as file:
            todo_list = file.readlines()
            if todo_list:
                print("TODOリスト:")
                for i, item in enumerate(todo_list, start=1):
                    print(f"{i}. {item.strip()}")
            else:
                print("TODOリストは空です。")
    else:
        print("TODOリストはまだ作成されていません。")

# TODOアイテムを追加する関数
def add_todo_item(item):
    with open(todo_filename, 'a') as file:
        file.write(item + '\n')
    print(f"'{item}' をTODOリストに追加しました。")

# TODOアイテムを削除する関数
def remove_todo_item(item_number):
    if os.path.exists(todo_filename):
        with open(todo_filename, 'r') as file:
            todo_list = file.readlines()
        if 1 <= item_number <= len(todo_list):
            removed_item = todo_list.pop(item_number - 1).strip()
            with open(todo_filename, 'w') as file:
                file.writelines(todo_list)
            print(f"'{removed_item}' をTODOリストから削除しました。")
        else:
            print("指定された番号のTODOアイテムは存在しません。")
    else:
        print("TODOリストはまだ作成されていません。")

# メインメニューを表示する関数
def main_menu():
    while True:
        print("\nメニュー:")
        print("1. TODOリストを表示")
        print("2. TODOアイテムを追加")
        print("3. TODOアイテムを削除")
        print("4. 終了")
        
        choice = input("選択してください: ")

        if choice == '1':
            show_todo_list()
        elif choice == '2':
            item = input("追加するTODOアイテムを入力してください: ")
            add_todo_item(item)
        elif choice == '3':
            show_todo_list()
            item_number = int(input("削除するTODOアイテムの番号を入力してください: "))
            remove_todo_item(item_number)
        elif choice == '4':
            print("アプリケーションを終了します。")
            break
        else:
            print("無効な選択です。再度選択してください。")

if __name__ == "__main__":
    main_menu()

Javascript 複数のスクリプトを読みこむ

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My JavaScript</title>
</head>
<body>
  <script src="main.js"></script>
  <script src="sub.js"></script>
</body>
</html>

main.js

'use strict';

{
let x = 10;
console.log(x);
}

sub.js

'use strict';

{
let x = 20;
console.log(x);
}

Javascript スコープ

index.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My JavaScript</title>
</head>
<body>
  <script src="main.js"></script>
</body>
</html>

main.js

'use strict';

let x = 10;
{
  x = 20;
  console.log(x);
}
console.log(x);