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- Which equals operator (== vs ===) should be used in JavaScript . . .
I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype value
- What does the !! (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 || let userAge =
- 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 . . .
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
- Whats the difference between and in JavaScript?
This operator is almost never used in JavaScript Other programming languages (like C and Java) use it for performance reasons or to work with binary data In JavaScript, it has questionable performance, and we rarely work with binary data This operator expects two numbers and returns a number In case they are not numbers, they are cast to
- javascript - Get the last item in an array - Stack Overflow
var linkElement = document getElementById("BackButton"); var loc_array = document location href split(' '); var newT = document createTextNode(unescape(capWords(loc_array[loc_array length-2]))); linkElement appendChild(newT); Currently it takes the second to last item in the array from the URL However, I want to do a check for the last item in the array to be "index html" and if so, grab the
- JavaScript hide show element - Stack Overflow
Learn how to use JavaScript to hide or show elements on a webpage effectively
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