{"id":66258,"date":"2026-07-27T08:24:00","date_gmt":"2026-07-27T01:24:00","guid":{"rendered":"https:\/\/www.rumahweb.com\/journal\/?p=66258"},"modified":"2026-07-22T09:32:25","modified_gmt":"2026-07-22T02:32:25","slug":"belajar-javascript-dasar-part-7","status":"publish","type":"post","link":"https:\/\/www.rumahweb.com\/journal\/belajar-javascript-dasar-part-7\/","title":{"rendered":"Belajar Javascript Dasar Part 7 \u2013 Parameter, Argument, dan Return Value"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Pada seri Belajar Javascript Dasar <strong><a href=\"https:\/\/www.rumahweb.com\/journal\/belajar-javascript-dasar-part-6\/\" target=\"_blank\" rel=\"noopener\" title=\"belajar javascript\">Part 6<\/a><\/strong>, kita telah mempelajari apa itu Function dan bagaimana cara menggunakannya untuk mengelompokkan kode agar lebih rapi dan mudah dikelola. Namun, sebuah function akan menjadi lebih bermanfaat jika dapat menerima data untuk diproses dan mengembalikan hasilnya.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Melanjutkan belajar Javascript Dasar Part 7 ini, kita akan mempelajari tiga konsep penting yang selalu digunakan saat bekerja dengan function, yaitu parameter, argument, dan return value. Dengan memahami ketiganya, Anda dapat membuat function yang lebih fleksibel, mudah digunakan kembali (reusable), dan mampu menghasilkan nilai sesuai kebutuhan program.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Parameter vs Argument, Apa Perbedaannya?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Banyak yang menganggap bahwa parameter dan argument adalah dua hal yang sama. Ini lumrah adanya. Keduanya memiliki kedekatan yang erat, biasanya muncul bersamaan pada suatu function sehingga sekilas akan terlihat sama. Padahal, keduanya memiliki peran yang berbeda.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Parameter <\/strong>adalah nama variabel yang sering dituliskan saat mendeklarasikan function. Parameter bisa dibilang sebagai <strong>wadah kosong<\/strong> yang nantinya akan diisi nilai tertentu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Supaya lebih jelas, mari dilihat contoh function sederhana berikut.&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function hitungBeratIdeal(tinggiBadan) {\n\n\/\/ \u2026\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"text-decoration: underline;\">Keterangan<\/span>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pada contoh diatas<strong> tinggiBadan <\/strong>merupakan parameter.<\/li>\n\n\n\n<li>Sementara <strong>argument <\/strong>adalah nilai sesungguhnya yang Anda kirimkan saat memanggil function tersebut.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>hitungBeratIdeal(160);&nbsp;\nhitungBeratIdeal(170); \nhitungBeratIdeal(180);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"text-decoration: underline;\">Keterangan<\/span>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>160, 170, 180<\/strong> merupakan argument.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Supaya lebih jelas dalam membedakannya, perhatikan contoh code program berikut.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11.png\"><img loading=\"lazy\" decoding=\"async\" width=\"642\" height=\"246\" src=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11.png\" alt=\"Belajar Javascript Dasar Part 7 \u2013 Parameter\" class=\"wp-image-66262\" srcset=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11.png 642w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11-300x115.png 300w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11-370x142.png 370w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11-270x103.png 270w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-11-570x218.png 570w\" sizes=\"auto, (max-width: 642px) 100vw, 642px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sudah terlihat lebih jelas kan sekarang, bahwa parameter dengan argument memiliki peran yang berbeda. Dengan memahami perbedaan tersebut, dapat memudahkanmu dalam menulis function di Javascript.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mengenal Default Parameter di Javascript<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Saat Anda bekerja dilingkungan Javascript kemudian mendapati code program yang Anda jalankan menampilkan hasil \u2018<strong>NaN<\/strong>\u2019 ini sering terjadi saat Anda lupa tidak mengisi <strong>Argumen <\/strong>saat memanggil function.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bila parameter function yang dipanggil tidak berisi nilai apapun, maka Javascript akan menganggapnya sebagai kosong. Sehingga yang terjadi adalah tampil hasil&nbsp; \u2018<strong>NaN<\/strong>\u2019.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Perhatikan gambar berikut.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13.png\"><img loading=\"lazy\" decoding=\"async\" width=\"663\" height=\"213\" src=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13.png\" alt=\"Belajar Javascript Dasar Part 7 \u2013 Default Parameter\" class=\"wp-image-66263\" srcset=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13.png 663w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13-300x96.png 300w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13-370x119.png 370w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13-270x87.png 270w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-13-570x183.png 570w\" sizes=\"auto, (max-width: 663px) 100vw, 663px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Untuk mengatasi masalah tersebut adalah, kita tambahkan <strong>default parameter<\/strong>. Dengan begitu bila kita lupa mengisi <strong>Argumentnya<\/strong>, maka secara otomatis Argument diisi oleh <strong>default parameter<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Berikut ini contohnya.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Contoh Script tanpa default parameter<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function hitungBeratIdeal(tinggiBadan) {\n\n\/\/ \u2026\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Contoh Script yang menggunakan default parameter<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function hitungBeratIdeal(tinggiBadan = 170) {\n\n\/\/ \u2026\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bagaimana, caranya terlihat sederhana saja kan ya? Kamu hanya perlu menambahkan tanda sama dengan&nbsp; (<strong>=<\/strong>) dan diikuti dengan nilai default-nya. Dengan cara ini, parameter akan bernilai<em> default value<\/em> saat user lupa mengisi nilai argumennya.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Return Value, mengembalikan nilai function<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Saat&nbsp; function JavaScript dijalankan, mesin akan menjalankan seluruh kode dalam function body. Secara default, function akan mengembalikan sebagai <strong><em>undefined<\/em><\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contoh sebelumnya.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png\"><img loading=\"lazy\" decoding=\"async\" width=\"510\" height=\"153\" src=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png\" alt=\"Belajar Javascript Dasar Part 7 \u2013 Return Value\" class=\"wp-image-66264\" srcset=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png 510w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-300x90.png 300w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-370x111.png 370w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-270x81.png 270w\" sizes=\"auto, (max-width: 510px) 100vw, 510px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Hal ini disebabkan karena method console.log tidak akan mengembalikan nilai apa pun dan JavaScript tidak menganggap ini sebagai error. Supaya function mengembalikan nilai (return statement), kita perlu gunakan kata kunci <strong>return<\/strong> dan diikuti nilai kembaliannya.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Berikut ini contoh perbaikannya.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png\"><img loading=\"lazy\" decoding=\"async\" width=\"510\" height=\"153\" src=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png\" alt=\"Belajar Javascript Dasar Part 7 \u2013 Return Value\" class=\"wp-image-66264\" srcset=\"https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14.png 510w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-300x90.png 300w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-370x111.png 370w, https:\/\/www.rumahweb.com\/journal\/wp-content\/uploads\/2026\/07\/image-14-270x81.png 270w\" sizes=\"auto, (max-width: 510px) 100vw, 510px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Kesimpulan<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pada seri <strong>Belajar Javascript Dasar<\/strong> Part 7 ini, kita telah mempelajari perbedaan antara <strong>parameter<\/strong> dan <strong>argument<\/strong>, serta memahami cara menggunakan <strong>default parameter<\/strong> dan <strong>return value<\/strong> dalam sebuah function. Ketiga konsep tersebut merupakan dasar yang penting karena hampir selalu digunakan saat membangun program menggunakan JavaScript.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dengan memahami materi ini, Anda dapat membuat function yang lebih fleksibel, mudah digunakan kembali (<em>reusable<\/em>), dan mampu mengembalikan hasil sesuai kebutuhan program. Kemampuan ini juga menjadi bekal sebelum mempelajari materi JavaScript yang lebih kompleks pada seri-seri berikutnya.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Demikian tutorial Belajar Javascript Dasar Part 7. Jangan lewatkan seri Belajar Javascript Dasar lainnya di Rumahweb untuk mempelajari JavaScript secara bertahap, mulai dari konsep dasar hingga teknik pemrograman yang lebih lanjut. Semoga bermanfaat!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quiz<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yuk, coba kuis belajar JavaScript dasar Part 7 tentang Parameter, Argument, dan Return Value berikut untuk menguji pemahaman kamu!<\/p>\n\n\n\n<div id=\"quiz-wrapper\">\n\n  <div id=\"progress\">Progress: 0 \/ 3<\/div>\n\n  <!-- Quiz 1 -->\n  <div class=\"quiz-box\">\n    <p><strong>Quiz 1:<\/strong> Pada kode berikut, manakah yang merupakan <strong>parameter<\/strong>?<\/p>\n\n<pre><code>function hitungBeratIdeal(tinggiBadan) {\n  return tinggiBadan - 100;\n}\n\nhitungBeratIdeal(170);<\/code><\/pre>\n\n    <button onclick=\"answer(this, false)\">170<\/button>\n    <button onclick=\"answer(this, true)\">tinggiBadan<\/button>\n    <button onclick=\"answer(this, false)\">return<\/button>\n\n    <p class=\"result\"><\/p>\n  <\/div>\n\n  <!-- Quiz 2 -->\n  <div class=\"quiz-box\">\n    <p><strong>Quiz 2:<\/strong> Apa yang terjadi jika function berikut dipanggil tanpa argument?<\/p>\n\n<pre><code>function hitungBeratIdeal(tinggiBadan = 170) {\n  return tinggiBadan - 100;\n}\n\nhitungBeratIdeal();<\/code><\/pre>\n\n    <button onclick=\"answer(this, false)\">JavaScript menghasilkan error.<\/button>\n    <button onclick=\"answer(this, true)\">Nilai tinggiBadan otomatis menjadi 170.<\/button>\n    <button onclick=\"answer(this, false)\">Nilai tinggiBadan menjadi undefined.<\/button>\n\n    <p class=\"result\"><\/p>\n  <\/div>\n\n  <!-- Quiz 3 -->\n  <div class=\"quiz-box\">\n    <p><strong>Quiz 3:<\/strong> Apa fungsi dari kata kunci <code>return<\/code> pada sebuah function?<\/p>\n\n<pre><code>function luasPersegi(sisi) {\n  return sisi * sisi;\n}<\/code><\/pre>\n\n    <button onclick=\"answer(this, false)\">Menampilkan hasil ke console.<\/button>\n    <button onclick=\"answer(this, true)\">Mengembalikan nilai hasil proses dari function.<\/button>\n    <button onclick=\"answer(this, false)\">Menghapus isi variabel.<\/button>\n\n    <p class=\"result\"><\/p>\n  <\/div>\n\n  <div id=\"score-box\"><\/div>\n\n<\/div>\n\n<style>\n.quiz-box {\n  border: 1px solid #e5e7eb;\n  border-radius: 12px;\n  padding: 16px;\n  margin-bottom: 20px;\n  background: #f9fafb;\n}\n\n.quiz-box pre {\n  background: #111827;\n  color: #f9fafb;\n  padding: 10px;\n  border-radius: 8px;\n  overflow-x: auto;\n  margin-bottom: 10px;\n}\n\n.quiz-box button {\n  display: block;\n  width: 100%;\n  text-align: left;\n  margin: 6px 0;\n  padding: 10px 12px;\n  border-radius: 8px;\n  border: none;\n  background: #e5e7eb;\n  cursor: pointer;\n  transition: .2s;\n}\n\n.quiz-box button:hover {\n  background: #d1d5db;\n}\n\n.quiz-box button:disabled {\n  cursor: not-allowed;\n}\n\n.result {\n  margin-top: 10px;\n  font-weight: bold;\n}\n\n.correct {\n  color: #16a34a;\n}\n\n.wrong {\n  color: #dc2626;\n}\n\n#progress {\n  margin-bottom: 20px;\n  font-weight: bold;\n}\n\n#score-box {\n  margin-top: 20px;\n  padding: 14px;\n  border-radius: 10px;\n  background: #eef2ff;\n  font-weight: bold;\n}\n<\/style>\n\n<script>\nlet totalAnswered = 0;\nlet score = 0;\n\nfunction answer(btn, isCorrect) {\n\n  const quiz = btn.parentElement;\n\n  if (quiz.classList.contains(\"answered\")) return;\n\n  quiz.classList.add(\"answered\");\n\n  const buttons = quiz.querySelectorAll(\"button\");\n  const result = quiz.querySelector(\".result\");\n\n  buttons.forEach(function(b){\n\n    if (b.getAttribute(\"onclick\").includes(\"true\")) {\n      b.style.background = \"#dcfce7\";\n      b.style.border = \"1px solid #16a34a\";\n    }\n\n    b.disabled = true;\n    b.style.opacity = \"0.7\";\n  });\n\n  btn.style.opacity = \"1\";\n\n  if (isCorrect) {\n    result.innerHTML = \"> Jawaban benar\";\n    result.className = \"result correct\";\n    score++;\n  } else {\n    result.innerHTML = \"X Jawaban salah\";\n    result.className = \"result wrong\";\n    btn.style.background = \"#fee2e2\";\n    btn.style.border = \"1px solid #dc2626\";\n  }\n\n  totalAnswered++;\n\n  document.getElementById(\"progress\").innerHTML =\n    \"Progress: \" + totalAnswered + \" \/ 3\";\n\n  if (totalAnswered === 3) {\n\n    let message = \"\";\n\n    if (score === 3) {\n      message = \"# Luar biasa! Kamu sudah memahami materi Parameter, Argument, Default Parameter, dan Return Value.\";\n    } else if (score === 2) {\n      message = \"# Bagus! Tinggal sedikit lagi agar semakin paham.\";\n    } else {\n      message = \"# Yuk pelajari kembali materi Parameter, Argument, Default Parameter, dan Return Value.\";\n    }\n\n    document.getElementById(\"score-box\").innerHTML =\n      \"<strong>Skor kamu: \" + score + \" dari 3<\/strong><br \/><br \/>\" + message;\n  }\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Pada seri Belajar Javascript Dasar Part 6, kita telah mempelajari apa itu Function dan bagaimana cara menggunakannya untuk mengelompokkan kode agar lebih rapi dan mudah dikelola. Namun, sebuah function akan menjadi lebih bermanfaat jika dapat menerima data untuk diproses dan mengembalikan hasilnya. Melanjutkan belajar Javascript Dasar Part 7 ini, kita akan mempelajari tiga konsep penting [&hellip;]<\/p>\n","protected":false},"author":319,"featured_media":66596,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[2592,2405,2593],"class_list":["post-66258","post","type-post","status-publish","format-standard","has-post-thumbnail","category-web-programming","tag-belajar-javascript","tag-javascript","tag-javascript-dasar"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Dalam Belajar Javascript Dasar Part 7 tentang parameter, argument, default parameter, dan return value beserta fungsi serta cara menggunakannya.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Anggit TS\"\/>\n\t<meta name=\"google-site-verification\" 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