Reuse Reduce

When exploring reuse reduce, it's essential to consider various aspects and implications. (double exclamation mark) operator do in JavaScript .... Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact === or !== operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide. javascript - When should I use ?? (nullish coalescing) vs || (logical ....

Related to Is there a "null coalescing" operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently. Previously most JavaScript code used ||. Why would a JavaScript variable start with a dollar sign?.

A valid JavaScript identifier shuold must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase). What is the correct way to check for string equality in JavaScript .... Moreover, in all other cases, you're safe to use ==. Not only is it safe, but in many cases it simplifies your code in a way that improves readability.

I still recommend Crockford's talk for developers who don't want to invest the time to really understand Javascript—it's good advice for a developer who only occasionally works in Javascript. How do I format a date in JavaScript? How do I format a Javascript Date object as a string? (Preferable format: 10-Aug-2010) How do I check for null values in JavaScript?

I wrote the code below but it didn't work. javascript - Wait 5 seconds before executing next line - Stack Overflow. From another angle, this function below doesn’t work like I want it to; being a JS novice I can’t figure out why.

I need it to wait 5 seconds before checking whether the newState is -1. Currently, it doesn’t wait, i... Similarly, javaScript hide/show element - Stack Overflow. Learn how to use JavaScript to hide or show elements on a webpage effectively. Is there a "null coalescing" operator in JavaScript?.

Moreover, javaScript now supports the nullish coalescing operator (??). It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns its left-hand-side operand. JavaScript validation for empty input field - Stack Overflow.