{"id":7577,"date":"2025-07-05T10:39:04","date_gmt":"2025-07-05T05:09:04","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=7577"},"modified":"2025-10-02T13:14:23","modified_gmt":"2025-10-02T07:44:23","slug":"playing-with-stacks-queues","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/playing-with-stacks-queues\/","title":{"rendered":"Playing with Stacks &amp; Queues"},"content":{"rendered":"\n<!-- PrismJS for Syntax Highlighting -->\n<link\n    href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.min.css\"\n    rel=\"stylesheet\"\n\/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.min.js\"><\/script>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/plugins\/autoloader\/prism-autoloader.min.js\"><\/script>\n\n<style>\n.wp_blog_theme {\n  --primary: #E58C32;\n  --secondary: #030302;\n  --light-bg: #fef9f4;\n  --text-dark: #2d2d2d;\n  --tab-radius: 12px;\n  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);\n  --code-bg: #001f3f;\n  --code-text: #d4f1ff;\n}\n\n.wp_blog_container {\n  font-family: 'Segoe UI', sans-serif;\n  background: var(--light-bg);\n  margin: 0;\n  padding: 0;\n  color: var(--text-dark);\n}\n\n\/* Heading *\/\n.wp_blog_main-heading {\n  text-align: center;\n  font-size: 2.4rem;\n  color: var(--primary);\n  margin-top: 2.5rem;\n  font-weight: bold;\n}\n\n\/* Explanation Card *\/\n.wp_blog_explanation,\n.wp_blog_code-tabs-container {\n  max-width: 940px;\n  margin: 2rem auto;\n  padding: 2rem;\n  background: white;\n  border-radius: var(--tab-radius);\n  box-shadow: var(--shadow);\n}\n\n\/* Text and Visuals *\/\n.wp_blog_explanation h2 {\n  font-size: 1.4rem;\n  color: var(--primary);\n  margin-bottom: 0.5rem;\n}\n\n.wp_blog_explanation p,\n.wp_blog_explanation li {\n  font-size: 1.05rem;\n  line-height: 1.7;\n  margin: 0.5rem 0;\n}\n\n.wp_blog_explanation code {\n  background: #fef9f4; 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    \/\/ Simply, Use Array as Stack.\n\nstack.push(1);      \/\/ Add inside stack\nstack.push(2);      \nstack.push(3);      \nconsole.log(stack); \/\/ [1, 2, 3]\n\nstack.pop();        \/\/ A stack is LIFO (Last In, First Out), so the element that goes in last will come out first. In this case, 3 will be removed.\nstack.pop();     \nconsole.log(stack); \/\/ [1]\n\nstack.push(7);      \/\/ [1, 7]\n\n\/\/ For Top element\nlet top = stack[stack.length - 1];\nconsole.log(top);   \/\/ 7\n\n\/\/ Invalid: stack[3] \u2013 violates stack discipline\n\/\/ It works fine because it's treated as an array, but this is invalid in the context of a stack.\n\/\/ Always use push, pop, and peek for proper stack usage.\n<\/code><\/pre>\n\n        <h2>Queue:<\/h2>\n        <p>\n            A <strong>Queue<\/strong> is a\n            <code>FIFO (First-In-First-Out)<\/code> data structure where the first element added is the first to be removed.\n        <\/p>\n\n        <h3>Common Operations \u2192 Queue<\/h3>\n        <ul>\n            <li><strong>Enqueue:<\/strong> Add an element to the end of the queue<\/li>\n            <li><strong>Dequeue:<\/strong> Remove the element from the front of the queue<\/li>\n            <li><strong>Peek\/Front:<\/strong> View the front element without removing it<\/li>\n        <\/ul>\n\n        <h3>Queue in JavaScript<\/h3>\n        <pre><code class=\"language-js\">let q = [];\n\n\/\/ Enqueue\nq.push(1);\nq.push(2);\nq.push(3);\nconsole.log(q); \/\/ [1, 2, 3]\n\n\/\/ Dequeue: Remove from front of the Queue\nq.shift(); \/\/ Removes 1\n\n\/\/ Peek: Get first element of queue.\nlet front = q[0];\nconsole.log(front); \/\/ 2\n\n\/\/ Invalid Syntax:\nq.pop(); \/\/ This works because it's an array method, but it removes from the end and breaks queue logic.\n\/\/ Queue should only remove from the front.\n<\/code><\/pre>\n    <\/div>\n<\/div>\n\n<script>\ndocument.addEventListener(\"DOMContentLoaded\", () => {\n  const buttons = document.querySelectorAll(\".wp_blog_code-tab-button\");\n  const contents = document.querySelectorAll(\".wp_blog_code-tab-content\");\n\n  buttons.forEach((button) => {\n    button.addEventListener(\"click\", () => {\n      const lang = button.getAttribute(\"data-lang\");\n\n      buttons.forEach((btn) => btn.classList.remove(\"active\"));\n      contents.forEach((content) => content.classList.remove(\"active\"));\n\n      button.classList.add(\"active\");\n      document\n        .querySelector(`.wp_blog_code-tab-content[data-lang=\"${lang}\"]`)\n        .classList.add(\"active\");\n    });\n  });\n\n  const themeToggle = document.getElementById(\"blogNotesThemeToggle\");\n  const themeContainer = document.querySelector(\".wp_blog_theme\");\n\n  themeToggle.addEventListener(\"click\", () => {\n    themeContainer.classList.toggle(\"dark-mode\");\n    themeToggle.textContent =\n      themeContainer.classList.contains(\"dark-mode\") ? 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