How to Implement Linear Search and Binary Search in JavaScript

This tutorial gives you an overview of linear search and binary search and highlights the difference between both.

In this tutorial, I’ll begin by explaining a few terms that’ll help us understand this concept.

So, to start off: an algorithm is a set of instructions given to a computer to perform a particular task.

Depending on the task you need to perform, an algorithm will perform it faster or more efficiently. Engineers look at this trade off when creating an algorithm for a given task.

We’ll be looking at how this plays out as we discuss linear (simple) search vs binary search.

Linear search

Sometimes called simple search, linear search is a method for finding an element within a list.

Suppose we have a list of numbers — let’s say, from 1 to 1000 — and we’re looking for a number in between these parameters. With simple search, we have look through each number one after the other til we find our match.

This means that — worst case scenario — we would have to look through the entire list before we can be sure of a match or be sure we don’t have a match.

A gif displaying the process involved in linear searches.

Check out the JavaScript implementation of linear search below:

const linearSearch = (list, target) => {
  for (let i = 0; i < list.length; i++){
    if( list[i] === target) return i
  return null;

const list = [1,2,3,4,5,6,7,8,9,10]
let result = linearSearch(list, 8);
console.log(result); // 8
result = linearSearch(list, 19);
console.log(result); // null

#javascript #programming #developer

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How to Implement Linear Search and Binary Search in JavaScript
Lets Cms

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Osiki  Douglas

Osiki Douglas


Binary Search in Python (Recursive and Iterative)

Searching for an element’s presence in a list is usually done using linear search and binary search. Linear search is time-consuming and memory expensive but is the simplest way to search for an element. On the other hand, Binary search is effective mainly due to the reduction of list dimension with each recursive function call or iteration. A practical implementation of binary search is autocompletion.

Python Binary Search Algorithm:

The objective of this project is to create a simple python program to implement binary search. It can be implemented in two ways: recursive (function calls) and iterative.

Project Prerequisites:

The project uses loops and functions to implement the search function. Hence good knowledge of python loops and function calls is sufficient to understand the code flow.

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Marcelo Kapi


Divide and Conquer: Binary Search in JavaScript

In the beginning, you will most likely try to use a brute force method to solve search problems; this is because it is the easiest and most rudimentary way to find a target. However brute force has a time cost; The Big O notation of brute force is usually and unacceptably equal to or greater than bigO(n²).

If you can make something work with the brute force technique you will most likely need to refactor it later. We have talked about bubble sort in JavaScript in the past. I mentioned that bubble sort uses the brute force technique for sorting an array in that article. Sorting has a time cost but it is needed to use Binary Search which has a bigO(log n).

Generally, when implementing a search problem you are better off to search from a sorted list. You can think about looking at a random list of Apartments from a google search. Now think about looking at a google list of Apartments sorted by distance from you. Generally sorted lists are much more useful. Binary Search will not work for an unsorted list because it uses a sort of educated guess; you cannot make educated guesses on random and arbitrary lists.

The first step in Binary Search is to sort the list so we can make an educated guess about where the target is located. You can use the built-in JavaScript methods.

However, I will reinvent the wheel because we are learning algorithms in JavaScript. You won’t be a JavaScript master until you can master the fundamentals first. These are the atoms of our universe and it’s good to know how to they interact with other the atoms of JavaScript.

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Santosh J


JavaScript compound assignment operators

JavaScript is unarguablly one of the most common things you’ll learn when you start programming for the web. Here’s a small post on JavaScript compound assignment operators and how we use them.

The compound assignment operators consist of a binary operator and the simple assignment operator.

The binary operators, work with two operands. For example a+b where + is the operator and the a, b are operands. Simple assignment operator is used to assign values to a variable(s).

It’s quite common to modify values stored in variables. To make this process a little quicker, we use compound assignment operators.

They are:

  • +=
  • -+
  • *=
  • /=

You can also check my video tutorial compound assignment operators.

Let’s consider an example. Suppose price = 5 and we want to add ten more to it.

var price = 5;
price = price + 10;

We added ten to price. Look at the repetitive price variable. We could easily use a compound += to reduce this. We do this instead.

price += 5;

Awesome. Isn’t it? What’s the value of price now? Practice and comment below. If you don’t know how to practice check these lessons.

Lets bring down the price by 5 again and display it.
We use console.log command to display what is stored in the variable. It is very help for debugging.
Debugging let’s you find errors or bugs in your code. More on this later.

price -= 5;

Lets multiply price and show it.

price *=5;

and finally we will divide it.

price /=5;

If you have any doubts, comment below.

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Создание фильтров поиска и товаров с помощью Javascript

Добро пожаловать в сегодняшнее руководство. В сегодняшнем руководстве мы узнаем, как создавать фильтры и искать товары. Для создания этого проекта нам понадобятся HTML, CSS и Javascript. Поскольку это довольно продвинутый проект, я бы не рекомендовал его новичку в javascript. Если вы средний уровень или эксперт в javascript, вы определенно можете сделать это.

Давайте посмотрим, что это за проект на самом деле. В проект входит серия карточек продуктов. У каждой из этих карт есть название, цена и категория. Над этими тегами находится панель поиска, где пользователи могут искать продукт по его названию.

Под панелью поиска находится группа кнопок. На каждой из этих кнопок есть название категории. Когда пользователь нажимает любую из этих кнопок, будут отображаться продукты, соответствующие этой конкретной категории.

Структура папок проекта:

Теперь давайте сначала создадим структуру каталогов проекта, чтобы мы могли начать кодирование. Начнем с создания папки проекта с названием «Фильтры и поиск продуктов». Внутри этой папки мы создаем три файла. Первый есть index.html, второй есть style.cssи третий есть script.js. Эти файлы представляют собой HTML-документы, таблицы стилей и файлы сценариев соответственно.


Начнем с HTML-кода. Сначала скопируйте приведенный ниже код и вставьте его в свой HTML-файл.

<!DOCTYPE html>
<html lang="en">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Product Filter And Search</title>
    <!-- Google Font -->
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
    <div class="wrapper">
      <div id="search-container">
          placeholder="Search product name here.."
        <button id="search">Search</button>
      <div id="buttons">
        <button class="button-value" onclick="filterProduct('all')">All</button>
        <button class="button-value" onclick="filterProduct('Topwear')">
        <button class="button-value" onclick="filterProduct('Bottomwear')">
        <button class="button-value" onclick="filterProduct('Jacket')">
        <button class="button-value" onclick="filterProduct('Watch')">
      <div id="products"></div>
    <!-- Script -->
    <script src="script.js"></script>


Далее, чтобы добавить стили в этот проект, мы используем CSS. Теперь скопируйте приведенный ниже код и вставьте его в свой файл CSS.

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  border: none;
  outline: none;
  font-family: "Poppins", sans-serif;
body {
  background-color: #f5f8ff;
.wrapper {
  width: 95%;
  margin: 0 auto;
#search-container {
  margin: 1em 0;
#search-container input {
  background-color: transparent;
  width: 40%;
  border-bottom: 2px solid #110f29;
  padding: 1em 0.3em;
#search-container input:focus {
  border-bottom-color: #6759ff;
#search-container button {
  padding: 1em 2em;
  margin-left: 1em;
  background-color: #6759ff;
  color: #ffffff;
  border-radius: 5px;
  margin-top: 0.5em;
.button-value {
  border: 2px solid #6759ff;
  padding: 1em 2.2em;
  border-radius: 3em;
  background-color: transparent;
  color: #6759ff;
  cursor: pointer;
.active {
  background-color: #6759ff;
  color: #ffffff;
#products {
  display: grid;
  grid-template-columns: auto auto auto;
  grid-column-gap: 1.5em;
  padding: 2em 0;
.card {
  background-color: #ffffff;
  max-width: 18em;
  margin-top: 1em;
  padding: 1em;
  border-radius: 5px;
  box-shadow: 1em 2em 2.5em rgba(1, 2, 68, 0.08);
.image-container {
  text-align: center;
img {
  max-width: 100%;
  object-fit: contain;
  height: 15em;
.container {
  padding-top: 1em;
  color: #110f29;
.container h5 {
  font-weight: 500;
.hide {
  display: none;
@media screen and (max-width: 720px) {
  img {
    max-width: 100%;
    object-fit: contain;
    height: 10em;
  .card {
    max-width: 10em;
    margin-top: 1em;
  #products {
    grid-template-columns: auto auto;
    grid-column-gap: 1em;


Наконец, нам нужно добавить функциональность к фильтру, а также реализовать функцию поиска. Чтобы он заработал, мы добавляем javascript. Скопируйте приведенный ниже код и вставьте его в свой файл javascript.

let products = {
  data: [
      productName: "Regular White T-Shirt",
      category: "Topwear",
      price: "30",
      image: "white-tshirt.jpg",
      productName: "Beige Short Skirt",
      category: "Bottomwear",
      price: "49",
      image: "short-skirt.jpg",
      productName: "Sporty SmartWatch",
      category: "Watch",
      price: "99",
      image: "sporty-smartwatch.jpg",
      productName: "Basic Knitted Top",
      category: "Topwear",
      price: "29",
      image: "knitted-top.jpg",
      productName: "Black Leather Jacket",
      category: "Jacket",
      price: "129",
      image: "black-leather-jacket.jpg",
      productName: "Stylish Pink Trousers",
      category: "Bottomwear",
      price: "89",
      image: "pink-trousers.jpg",
      productName: "Brown Men's Jacket",
      category: "Jacket",
      price: "189",
      image: "brown-jacket.jpg",
      productName: "Comfy Gray Pants",
      category: "Bottomwear",
      price: "49",
      image: "comfy-gray-pants.jpg",

for (let i of {
  //Create Card
  let card = document.createElement("div");
  //Card should have category and should stay hidden initially
  card.classList.add("card", i.category, "hide");
  //image div
  let imgContainer = document.createElement("div");
  //img tag
  let image = document.createElement("img");
  image.setAttribute("src", i.image);
  let container = document.createElement("div");
  //product name
  let name = document.createElement("h5");
  name.innerText = i.productName.toUpperCase();
  let price = document.createElement("h6");
  price.innerText = "$" + i.price;


//parameter passed from button (Parameter same as category)
function filterProduct(value) {
  //Button class code
  let buttons = document.querySelectorAll(".button-value");
  buttons.forEach((button) => {
    //check if value equals innerText
    if (value.toUpperCase() == button.innerText.toUpperCase()) {
    } else {

  //select all cards
  let elements = document.querySelectorAll(".card");
  //loop through all cards
  elements.forEach((element) => {
    //display all cards on 'all' button click
    if (value == "all") {
    } else {
      //Check if element contains category class
      if (element.classList.contains(value)) {
        //display element based on category
      } else {
        //hide other elements

//Search button click
document.getElementById("search").addEventListener("click", () => {
  let searchInput = document.getElementById("search-input").value;
  let elements = document.querySelectorAll(".product-name");
  let cards = document.querySelectorAll(".card");

  //loop through all elements
  elements.forEach((element, index) => {
    //check if text includes the search value
    if (element.innerText.includes(searchInput.toUpperCase())) {
      //display matching card
    } else {
      //hide others

//Initially display all products
window.onload = () => {

Теперь ваш поиск и фильтр по продукту готовы. Надеюсь, вам понравился урок.