The Javascriptdouble question markoperator is a logical operator known as the nullish coalescing operator. It returns the right-side expression as the default value if the left-side values arenullorundefined. It works similarly to theORoperator but the??operator does not return the right-side exp...
\” Double quotation mark \’ Single quotation markYou’ll be using escape characters for displaying information to the user. For example, if you want to display a more complex message box, here’s how to do it:Copy alert("Mark said: \"What are 'escape characters'?\"\n\nIt seemed ...
Ask Question Asked10 months ago Modified10 months ago Viewed22 times 0 I am usingmarkjs.ioto highlight content on my page on-demand - but I want to retain any range selections once the marks are added - currently it's inconsistent between double-clicking on a word verses selecting a word...
Practically, instead of real network calls to APIs, use some test double library (like Sinon, Test doubles, etc) for stubbing the API response. The main benefit is preventing flakiness - testing or staging APIs by definition are not highly stable and from time to time will fail your tests...
// Double bad: if opts is falsy it'll be set to an object which may // be what you want but it can introduce subtle bugs. opts = opts || {}; // ... } // still bad function handleThings(opts) { if (opts === void 0) { opts = {}; } // ... } // good function ...
A personal search engine can make it easy to find info that's hard to remember. Learn how to make your own Q&A search engine or just copy/paste the code into a web page.
If you need to include only one instance of a single or double quote within a string (e.g.,"Welcome to Joe's Diner."), you can do so without special characters. This is because upon encountering the start of a string, JavaScript treats ensuing characters—up to the next occurrence of...
‘hellO’);. It’s easy to forget either the opening or closing quote mark. It’s also easy to mix up those quote marks; for instance, by pairing a single-quote with a double quote like this:alert(‘hello”);. In either case, you’ll probably see an “Uncaught SyntaxError: ...
In JavaScript, there are three ways to write a string — they can be written inside single quotes (' '), double quotes (" "), or backticks (` `). The type of quote used must match on both sides, however it is possible that all three styles can be used throughout the same script...
Practically, instead of real network calls to APIs, use some test double library (like Sinon, Test doubles, etc) for stubbing the API response. The main benefit is preventing flakiness - testing or staging APIs by definition are not highly stable and from time to time will fail your tests...