JavaScript Loop Playground by @jowinb - Codewith.it

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>JavaScript Loop Playground</title>
  <style>
    body { font-family: Arial, sans-serif; margin: 20px; }
    .loop-card { margin-bottom: 30px; }
    .loop-card input, .loop-card select, .loop-card button { margin: 5px; }
    #output { margin-top: 10px; }
  </style>
</head>
<body>
  <h1>JavaScript For Loops Playground</h1>


  <div class="loop-card" id="count-up">
    <h3>Count Up 1 → 15</h3>
    <button class="run-loop">Run</button>
    <button class="reset-loop">Reset</button>
    <div class="output"></div>
  </div>

  <div class="loop-card" id="count-down">
    <h3>Count Down 15 → 1</h3>
    <button class="run-loop">Run</button>
    <button class="reset-loop">Reset</button>
    <div class="output"></div>
  </div>

  <div class="loop-card" id="odd-numbers">
    <h3>Odd Numbers 1 → 30</h3>
    <button class="run-loop">Run</button>
    <button class="reset-loop">Reset</button>
    <div class="output"></div>
  </div>

  <h2>Advanced Playground: Build Your Own Loop</h2>
  <label for="start">Start: </label><input type="number" id="start" value="1">
  <label for="end">End: </label><input type="number" id="end" value="10">
  <label for="step">Step: </label><input type="number" id="step" value="1">
  <label for="filter">Filter: </label>
  <select id="filter">
    <option value="None">None</option>
    <option value="Odd">Odd only</option>
    <option value="Even">Even only</option>
    <option value="Multiples of 5">Multiples of 5</option>
  </select>
  <button id="run-custom-loop">Run</button>
  <button id="reset-custom-loop">Reset</button>
  <div id="custom-output"></div>

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

document.addEventListener('DOMContentLoaded', function() {
  
  function runLoop(start, end, step, filter) {
    let results = [];
    for (let i = start; i <= end; i += step) {
      if (filter === 'Odd' && i % 2 === 0) continue;
      if (filter === 'Even' && i % 2 !== 0) continue;
      if (filter === 'Multiples of 5' && i % 5 !== 0) continue;
      results.push(i);
    }
    return results;
  }

  function updateOutput(outputDiv, results) {
    outputDiv.innerHTML = results.join(', ');
  }

  document.querySelectorAll('.run-loop').forEach(button => {
    button.addEventListener('click', function() {
      const card = this.closest('.loop-card');
      const outputDiv = card.querySelector('.output');
      let results;
      
      if (card.id === 'count-up') {
        results = runLoop(1, 15, 1, 'None');
      } else if (card.id === 'count-down') {
        results = runLoop(15, 1, -1, 'None');
      } else if (card.id === 'odd-numbers') {
        results = runLoop(1, 30, 1, 'Odd');
      }
      updateOutput(outputDiv, results);
    });
  });

  // Reset buttons
  document.querySelectorAll('.reset-loop').forEach(button => {
    button.addEventListener('click', function() {
      const card = this.closest('.loop-card');
      card.querySelector('.output').innerHTML = '';
    });
  });

  document.getElementById('run-custom-loop').addEventListener('click', function() {
    const start = parseInt(document.getElementById('start').value);
    const end = parseInt(document.getElementById('end').value);
    const step = parseInt(document.getElementById('step').value);
    const filter = document.getElementById('filter').value;
    const results = runLoop(start, end, step, filter);
    updateOutput(document.getElementById('custom-output'), results);
  });

  document.getElementById('reset-custom-loop').addEventListener('click', function() {
    document.getElementById('custom-output').innerHTML = '';
  });
});