I am curious about the potential to create a unique scenario using JavaScript. Imagine having two arrays:
a = [1, 2, 3]
b = [4, 5, 6]
What if we could combine these arrays into a new array, c, that encapsulates both:
c = [1, 2, 3, 4, 5, 6]
The intriguing part is making changes to one of the original arrays automatically reflect in array c as well:
a[1] = 1
c = [1, 1, 3, 4, 5, 6]
My question is: Is there a way to implement this functionality in JavaScript?
In JavaScript, the traditional pass-by-reference method is not available, requiring developers to implement a workaround solution. One simple approach involves dynamically returning 'c' as a combination of 'a' and 'b' within a function. Another option is to utilize an object with getter/setters to control the manipulation of values when accessing 'c'.
For example:
var $ = (function () {
/* Arrays kept hidden */
var a = [1, 2, 3];
var b = [4, 5, 6];
/* Visible object */
return {
get a () {
return a;
},
set a (v) {
a = v;
},
get b () {
return b;
},
set b (v) {
b = v;
},
get c () {
return a.concat(b);
},
};
})();
/* Example */
console.log(JSON.stringify($.a), JSON.stringify($.b), JSON.stringify($.c));
$.a = [0, 1, 2];
console.log(JSON.stringify($.a), JSON.stringify($.b), JSON.stringify($.c));
$.b[1] = 7;
console.log(JSON.stringify($.a), JSON.stringify($.b), JSON.stringify($.c));To access the data, utilize a Proxy server.
const x = [7,8,9];
const y = [10,11,12];
const z = new Proxy([x,y], {
_localIndex: function(arrays, index) {
index = +index;
if( isNaN(index)) throw new TypeError("Invalid index provided");
if( Math.floor(index) !== index) throw new RangeError("Index must be an integer");
if( index < 0) throw new RangeError("Positive integer required for index");
for( let i=0; i<arrays.length; i++) {
if( arrays[i].length > index) return [i,index];
index -= arrays[i].length;
}
throw new RangeError("Index is out of bounds");
},
get: function(arrays, index) {
if( index === "size") {
return arrays.reduce((a,c)=>a+c.length,0);
}
if( index === "collection") {
return arrays;
}
const [arr, idx] = this._localIndex(arrays, index);
return arrays[arr][idx];
},
set: function(arrays, index, value) {
const [arr, idx] = this._localIndex(arrays, index);
arrays[arr][idx] = value;
}
});
console.log("Accessing element at index 4 in array z: "+z[4]);
z[2] = 15;
console.log("Updated element at index 2 in array z, first array now contains: "+JSON.stringify(x));
console.log("Original source array for z: "+JSON.stringify(z.collection));
x.push('y');
console.log("Added 'y' to array x, current state of z: "+JSON.stringify(z.collection));Looking for a small program that can dynamically change a word within an SVG? The goal is to create an effect where regardless of the word or group of words, they always stretch along the entire height (due to a 90-degree rotation) by adjusting the font si ...
Say I need to display information about a product, but first I must make a GET request to get the data and assign it to the product. I'm wondering, should the default value for product in the data() function be undefined or null, and is there a differ ...
As I delve into react routing practice, I've put together a geography-based web app. Starting off, I configured the router paths: import { StrictMode } from "react"; import { createRoot } from "react-dom/client"; import { BrowserRo ...
I have a requirement to upload a photo to Facebook using the Javascript SDK, but I am experiencing some difficulties: Firstly, FB.login(function (response) { if (response.authResponse) { va ...
I'm experiencing a challenge with this code as it repeats when already chosen. My goal is to add data in the database once something has been selected. When I click on spin, the randomizer will choose a name and update their status to "done". Subsequ ...
Currently, I'm in the process of scraping LinkedIn profiles with the help of this library: https://www.npmjs.com/package/@n-h-n/linkedin-profile-scraper. Listed below is the code snippet that I am using: <script> import { LinkedInProfileScraper ...
<script> const tally ={ total: 0, increase: function(){ total++; console.log(total); } } const selectBtn = document.getElementsByTagName('button& ...
Is there a way to loop through an array and check if each word is a palindrome, instead of manually passing an argument for each word? If a word is a palindrome, return the word; otherwise, return 0. var myArray = ['viicc', 'cecarar', ...
Currently, I'm working on incorporating a form using the react-hook-form library. Despite following the documentation and utilizing the handleSubmit function along with a custom Axios post for the onSubmit parameter like this: onSubmit={handleSubmit( ...
I'm currently utilizing AngularJS to perform basic form validation. Below is the current code snippet: <form name="myForm" id="form_id" method="post" novalidate> <div class="form-group"> <label for="myField_input" class="c ...
Currently, I have implemented a feature that loads more posts through AJAX when the user clicks on a 'load more' button. The code I utilized is based on a tutorial found at this link. My goal now is to enhance this functionality so that instead ...
This script changes colors when a row in a specific column is clicked: $(document).ready(function(){ $("#rowClick").children("tbody").children("tr").children("td").click(function(){ $(this.parentNode).toggleClass("enroute"); }); }); CSS: .placed{ b ...
I have encountered an issue while trying to call a service method in AngularJS. The service method is being called successfully, but it is not returning any value to the controller function that invoked it. If anyone can offer assistance, I would greatly ...
I am looking to create an array structured like the following:- arr[0][from] = value arr[0][to] = value arr[1][from] = value arr[1][to] = value . . And so forth. I have input array html elements for the from & to fields. <input type="text" name ...
Why is it that when I try to run "require('child-process')" in the node shell, I receive an error saying "Cannot find module 'child-process'"? It seems like "child-process" should be a default library in Node. Any insights on what could ...
I am facing an issue with adding dynamic form fields to the database using PHP. I have utilized angular for this purpose, but only the last form field is getting inserted into the database. To address this, I attempted using arrays and loops to increment a ...
Attempting to add a condition within getServerSideProps: export async function getServerSideProps(context) { const jwt = parseCookies(context).jwt || null; if (jwt) { const user = parseJwt(jwt); const userId = user.id; console.log(userId); ...
In the Document Object Model (DOM), there is a button available to remove the parent element here: <i class="fa fa-times remove-product-compare" aria-hidden="true"></i> Here is an example of my DOM structure: <div class="col-lg-12 col-md- ...
I am a beginner in AngularJs and I am trying to make a post request to a server with enum form. Currently, I have the following JavaScript code: function completeTaskAction2($scope, $http, Base64) { $http.defaults.headers.common['Authorization'] ...
How can I fix the issue with my alerts not working on my iOS project? I am using Ionic and AngularJS to develop my app. The problem I am facing is that when the alert pops up, the title shows as "index.html". This is how I call the alert: alert("aaa"); ...