Do 3 arrays contain a common element, if they contain output it. For example: [1,2,3], [2,3], [2,4] -> answer = 2 let arr1 = [1, 3, 11, 32, 44, 99]; let arr2 = [4, 12, 15, 99]; let arr3 = [4, 11, 13, 15, 23, 43]; function searchThreeSameNum(arr1, arr2, arr3) { let i = 0; … Read more
I am really new to javascript, and stumbled upon the return keyword. Basically, what is the difference in terms of these 2 statements? <input type=”checkbox” onclick=”doAlert()” /> vs <input type=”checkbox” onclick=”return doAlert();” /> Essentially, both returned the same results and called the function, but is there more to it? Any help greatly appreciated :). Thanks! … Read more
When you wrap your JavaScript code in a function like this: (function(){ var field = …; function doSomthing(){… … })(); I noticed that this fixes scoping problems for me on a lot of web pages. What is this practice called? Answer The pattern is called self-invocation, a self-invoking function. It can create a closure, but … Read more
How do I make a DIV always float on the screen’s top right corner, so that even when I scroll the page down, the DIV still shows up in the same fixed location? Thanks. Answer Use position: fixed, and anchor it to the top and right sides of the page: #fixed-div { position: fixed; top: … Read more
In order to refactor a client-side project, i’m looking for a safe way to find (and delete) unused code. What tools do you use to find unused/dead code in large react projects? Our product has been in development for some years, and it is getting very hard to manually detect code that is no longer … Read more
This question already has answers here: How to read a local text file? (22 answers) Closed 6 years ago. I have a text file in the same folder as my JavaScript file. Both files are stored on my local machine. The .txt file is one word on each line like: red green blue black I … Read more
So I’m trying to make a very basic node.js server that with take in a request for a string, randomly select one from an array and return the selected string. Unfortunately I’m running into a few problems. Here’s the front end: function newGame() { guessCnt=0; guess=””; server(); displayHash(); displayGuessStr(); displayGuessCnt(); } function server() { xmlhttp … Read more
I am writing an Array-derived class in JavaScript and need to know which functions to overload so that I can be aware of changes made to the array. I know Array.push() and Array.splice() are mutating. Is there a definitive list of any others? Answer You can find the list on MDN as Mutator methods (along … Read more
I know this is a pretty basic question over here. But could you tell me all possible options available to, call a Control Action Method [generally any server side routine] from a Razor View and, in what scenarios each are best applicable to be used in. Thanks. Answer Method 1 : Using jQuery Ajax Get … Read more
I have a form where the input fields are saved onChange. In Firefox (5) this works even when the window is closed, but for Chrome and IE it doesn’t and I need to be sure that I’m saving this data even if they try to close the window after they’ve typed in a field but … Read more
