Upon testing the code from a book on page 72 in both FF and NodeJS, it was discovered that y.lastIndex equaled 0 and x === y evaluated to false.
Why is there a discrepancy between the book's information and the actual behavior of the code?
function make_a_matcher() {
return /a/gi;
}
var x = make_a_matcher();
var y = make_a_matcher();
// Be aware that x and y reference the same object!
x.lastIndex = 10;
document.writeln(y.lastIndex); // 10
This situation is quite bizarre, but I am inclined to believe it is an error. Unless, of course, older JavaScript interpreters stored regular expression literals in cache and repeatedly returned the same instance.
As pointed out by @xyz in the comments, it seems that The ES3 standard allowed caching of literals, but this practice was restricted in ES5. Big thanks to @xyz for clarifying this.
Regardless, this information has been flagged as an Unconfirmed Errata.
I have two distinct navigational sections on my website. The left column has its own navigation menu, while the right column (main content area) contains a separate set of links: My goal is to click on a link in the left-hand sidebar (such as "Resume", "E ...
Within my React app using react-bootstrap, I have implemented an accordion component that expands or collapses based on the user's interaction with a text input located in the AccordianHeader component. Interestingly, whenever the spacebar is released ...
I'm facing an issue with my code that involves redirecting the page to the index page after clicking on a specific link ('#versionPageFromProdLink'). The index page contains certain content within a div, which I want to hide once the redirec ...
Here is some code I'm using to fade out certain elements on a webpage if the mouse hasn't moved for a period of time: idleTime = 0; var idleInterval = setInterval(function() { idleTime++; if (idleTime > 1) { var isHovered = $ ...
Recently delving into the world of AngularJs has been a captivating experience for me. I am aiming to develop a component with a constructor that accepts a parameter of type string. However, when I try to declare the selector on the HTML file, the componen ...
Currently, I am facing an issue with connecting to an existing MySQL database using Sequelize in Node. The database consists of a products table, a categories table, and a categories_products table. My goal is to fetch products, where each product includes ...
Can anyone help me with this issue that I'm facing? I am working on a JavaScript web page and trying to show a Google map (Google API) along with a canvas tag in the html body. Currently, the map and canvas are only displaying separately. https://i ...
Currently, I have a function that checks if a user is authenticated: isAuthenticated = (): boolean => { xxx }; I am working with AngularJS and I want to create a new function called keepCheckingAuthentication() This new function should call the ...
I have a range of Product items in my inventory and when a client places an Order, they submit an array of objects. Each object in the array includes the _id product (objectId) and the quantity they purchased. [ {producId: "dshsdsdh72382377923", quantity: ...
I'm currently working on transforming the API response to make it more suitable for constructing two tables. Despite adding debugging outputs within my function in created(), I am witnessing the desired output temporarily, but upon further examination ...
Can anyone lend a hand? I feel like I must be overlooking something really obvious. I'm having trouble calling my function to execute my ajax call. Any assistance would be greatly appreciated. Thank you! Here is an excerpt of the HTML code: $(docu ...
I have a .js file that contains the following data (excerpt for brevity) var albums= "tracks":[ {"title":"Dunnock","mp3":"Birdsong-Dunnock.mp3", "lyrics":"The Dunnock or hedge sparrow has a fast warbling song often delivered from t ...
I have encountered an issue where the app functions correctly when I open the HTML file in my browser, but fails to load the CSS and JavaScript when accessing it through localhost:3000. HTML: <html> <head> <link href="./main.css" rel="st ...
As I attempt to set a cookie named auth, containing the user's ID signed with JWT, I am puzzled by not seeing the auth cookie in Chrome when visiting http://localhost:5000/. Instead, I only observe these two cookies; https://i.sstatic.net/p0Foo.p ...
Following the installation guide for Tailwind CSS, I ran the command npm install -D tailwindcss postcss autoprefixer npx tailwindcss init -p. Despite this, the background className (bg-black) is not working as expected. Here are the file paths: Directory ...
Reviewing the source code: import { async, ComponentFixture, TestBed } from '@angular/core/testing'; import { IonicModule } from '@ionic/angular'; import { HomePage } from './home.page'; import { LevelGridComponent } from &a ...
Currently delving into the world of the Ink library for constructing a console application in Javascript. Despite having experience with React, this is a different ball game. Some of the nuances are proving to be quite perplexing. I've managed to get ...
Assuming $dom is a jQuery element, can the following line be safely removed if a is not utilized thereafter? var a = $dom.clone(true,true); When using $dom.clone(false,false), it appears that there are no side effects. I believe this method doesn't ...
For my TypeScript application, I am utilizing WebPack to transpile and bundle the code. The final result is intended to be used in a pure JavaScript website. One of the components in my application is an enum defined as follows: export const enum ShapeTyp ...
I am currently working on a movie listing website where all the movies are displayed in sequence based on their #TITLE#. The webpage is generated automatically by the software using a template file. Here is the section of code in the template file that sho ...