Looking at a sorted array like this:
var arr = [ "aasd","march","mazz" ,"xav" ];
If I'm searching for the first occurrence of a letter that starts with "m", how can I achieve it without iterating through the entire array?
Looking at a sorted array like this:
var arr = [ "aasd","march","mazz" ,"xav" ];
If I'm searching for the first occurrence of a letter that starts with "m", how can I achieve it without iterating through the entire array?
One effective approach is to implement a binary search for identifying words that begin with the desired letter, then iterate backward to locate the initial occurrence.
Is there a more efficient way to accomplish this task without iterating through the entire array?
A solution could be to iterate only until you find the desired match.
If you prefer not to use a traditional looping construct like a for or while loop, you can utilize the Array's find() method.
For instance, using
arr.find(word => word.startsWith("m"))If you're looking to find the first element in an array that meets a specific condition, the find() function is your go-to solution.
For example, if you want to find the first word in an array that starts with the letter "m", you can achieve this easily using the startsWith() function like so:
// Your array
var arr = [ "aasd","march","mazz" ,"xav" ];
// Find the first match starting with "m"
arr.find(function(word){ return word.startsWith('m');}); // Result: "march"
If your matching criteria is more complex and requires pattern matching, regular expressions combined with the test() function can be used. The following example demonstrates how to find the first element that begins with "m":
// Your array
var arr = [ "aasd","march","mazz" ,"xav" ];
// First match starting with "m"
var match = arr.find(function(word){ return /^m/i.test(word);}); // Result: "march"
Check out this code snippet for a practical example:
var arr = ["aasd", "march", "mazz", "xav"];
var match = arr.find(function(word) { return /^m/i.test(word); });
alert(match);Searching through the entire array is unnecessary - just go until you come across what you're looking for
function getIndex(arr, letter){
for(var x=0;x<arr.length;x++){
if(arr[x].charAt(0) === letter)
return x;
}
return -1; // no match
}
If you want to find a specific element in an array based on a condition, you can utilize the Array#some() method.
The
some()method checks if at least one element in the array satisfies the provided condition function.
function findElement(element, array) {
let index;
array.some(function (item, idx) {
if (item[0] === element) {
index = idx;
return true;
}
});
return index;
}
let elements = ["apple", "banana", "cherry", "date"];
document.write(findElement('c', elements));I have a JavaScript function with HTML code inside. I need the ".one-card" div to repeat four times within each ".row" div. The ".row" div is being repeated in a foreach loop. I want to check if the result of modulo (4) is not equal to zero, then display t ...
Given a minimum number of 10.5 and a maximum number of 29.75, the task is to generate an array within these two ranges with a specific length denoted by 'n'. While the function for generating the array is provided below, it is important to calcul ...
Is it possible to extract binary data from an HTML Canvas? Currently, I have the following HTML code displaying an input file and a canvas below it: <p><button id="myButton" type="button">Get Image Content</button></p> <p>In ...
Seeking advice on a more efficient way to improve the code below and make it DRY: <h2>{{ title }}</h2> <p>{{ subtitle }}</p> I am currently checking this.name for both the title and subtitle, wondering if there is a better implemen ...
const filteredParams = [...appliedFilters].reduce((prev, curr) => { if (curr.key !== "multi") return { ...prev, ...curr.selectedValue.params }; return; }, {}); When I run this code, I encounter the following warning message in ...
In my Node.js library package called "OasisLib," there is a file named TypeGenerator.ts. The specific logic within the file is not crucial, but it requires access to files in the filesystem during the project build process. To achieve this, we utilized let ...
Can I perform bitwise operations on the entire char array? Here is a working example: unsigned int aNumInt = 0xFFFF; //1111111111111111 aNumInt = aNumInt << 8; //1111111100000000 Is it possible to do the same with an entire array of char? Non-work ...
I'm having trouble locating proper documentation for MUI components. Whenever I attempt to replicate an example from the site, I struggle to customize it to fit my requirements. There are numerous props used in these examples that I can't seem to ...
Looking to utilize the pokedex-promise for a pokemonapi, however, the documentation only provides examples on how to require it in vanilla JavaScript: npm install pokedex-promise-v2 --save var Pokedex = require('pokedex-promise-v2'); var P = new ...
I have a side navigation bar on my webpage that I obtained from a React Bootstrap website, so the class names are already pre-loaded. Instead of using a toggle hamburger icon to expand or collapse the navigation, I want to achieve this functionality based ...
Currently, I am developing an express web application with a Parse backend. To render webpages, I am utilizing .ejs files. Upon clicking the submit button on the file upload form, Express routes me to testfile.js where I am using the Parse.File method to u ...
I'm currently working on building a sortable list using the react.js library known as "react-sortable-hoc" (https://github.com/clauderic/react-sortable-hoc). Within my "SortableList" component, I've implemented a mapping function on each element ...
After successfully implementing Posthog with React and testing it on Chrome and Firefox, we encountered issues when trying to test it on Brave/Microsoft Edge Browsers. It appears that the default ad blocker feature in these browsers is causing the problem. ...
I am encountering an issue with my node/express js application running on localhost while making a 'GET' request to Instagram's api. The error message I keep receiving is: XMLHttpRequest cannot load https://api.instagram.com/oauth/authorize ...
Can we create a typedef for a 2D array in C? For example: typedef char[10][10] board; The above example does not compile. Is there a workaround to achieve this or any alternate solution? ...
I developed a web-based app that functions as a simple calculator for calculating freight/shipping prices to Venezuela. The app allows users to select between 1 to 4 packages, and choose different types of freight including air (normal, express) and mariti ...
Can the optional chaining operator be used on the left side of an assignment (=) in JavaScript? const building = {} building?.floor?.apartment?.number = 3; // Is this functionality supported? ...
I have a weekly schedule that I update regularly using a static table layout: <table> <tr class="live gm fsp"> <td>Oct. 7</td> <td>12:30 pm</td> <td class="prog">Show 1</td> <td>Team ...
I have created an HTML file and the corresponding controller logic for this page. I can see the data in the console, but it's not displaying on my UI. <div id="panelDemo14" class="panel panel-default" ng-controller="NoticeController"> < ...
As I dive into the world of nextjs, I'm coming across conflicting information. Some sources claim that nextjs only prerenders the first page, while others suggest that all pages are prerendered by default. This contradiction has left me confused about ...