<header>
  <h2 class="title">String.prototype.charAt()</h2>
  <p class="description">Повертає символ за вказаним індексом у рядку.</p>
</header>
<main>
  <div class="result">
    <input type="text" id="inputString" placeholder="Введіть рядок" />
    <input type="number" id="charIndex" placeholder="Введіть індекс" />
    <button onclick="getCharacter()">Отримати символ</button>
    <p>Символ: <span id="outputCharacter">-</span></p>
  </div>
</main>

body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

input[type="text"], input[type="number"] {
  margin: 10px 0;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  display: block;
}

button {
  padding: 10px 15px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

#outputCharacter {
  font-weight: bold;
}

function getCharacter() {
  var inputString = document.getElementById('inputString').value;
  var index = document.getElementById('charIndex').value;
  var outputCharacter = document.getElementById('outputCharacter');

  if (index < 0 || index >= inputString.length) {
    outputCharacter.textContent = 'Індекс за межами рядка.';
  } else {
    outputCharacter.textContent = inputString.charAt(index);
  }
}

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External JavaScript

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