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2. Which equals operator (== vs ===) should be used in JavaScript...

   stackoverflow.com/questions/359494

   JavaScript has two sets of equality operators: === and !==, and their evil twins == and !=. The good ones work the way you would expect. The good ones work the way you would expect. If the two operands are of the same type and have the same value, then === produces true and !== produces false .

3. How do you use the ? : (conditional) operator in JavaScript?

   stackoverflow.com/questions/6259982

   It's a little hard to google when all you have are symbols ;) The terms to use are "JavaScript conditional operator". If you see any more funny symbols in JavaScript, you should try looking up JavaScript's operators first: Mozilla Developer Center's list of operators. The one exception you're likely to encounter is the $ symbol.

4. What does the !! operator do in JavaScript? - Stack Overflow

   stackoverflow.com/questions/784929

   Because JavaScript has what are called "truthy" and "falsy" values, there are expressions that when evaluated in other expressions will result in a true or false condition, even though the value or expression being examined is not actually true or false.

5. javascript - When should I use ?? (nullish coalescing) vs ||...

   stackoverflow.com/questions/61480993

   ) in JavaScript only considers null or undefined as "nullish" values. If the left-hand side is any other value, even falsy values like "" (empty string), 0 , or false , it will not use the right-hand side:

6. syntax - What's the meaning of "=>" (an arrow formed from equals...

   stackoverflow.com/questions/24900875

   JavaScript arrow functions are roughly the equivalent of lambda functions in python or blocks in Ruby. These are anonymous functions with their own special syntax and operate in the context of their enclosing scope. This mean they do not have their own "this" but instead access the one from the immediate enclosing function. From the ECMA standard:

7. javascript - What does the '#' character (number sign) mean in...

   stackoverflow.com/questions/10899448

   For id selectors, jQuery uses the JavaScript function document.getElementById(), which is extremely efficient. When another selector is attached to the id selector, such as h2#pageTitle, jQuery performs an additional check before identifying the element as a match.

8. What is the difference between != and !== operators in...

   stackoverflow.com/questions/1889260

   Also at In JavaScript, is '!=' the same as '!=='?. More answers, but this is the duplicate target. More answers, but this is the duplicate target. – Peter Mortensen

9. What does ${} (dollar sign and curly braces) mean in a string in...

   stackoverflow.com/questions/35835362

   I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere.

10. What is the purpose of the dollar sign in JavaScript?

    stackoverflow.com/questions/846585

    Unlike many similar languages, identifiers (such as functional and variable names) in Javascript can contain not only letters, numbers and underscores, but can also contain dollar signs. They are even allowed to start with a dollar sign, or consist only of a dollar sign and nothing else. Thus, $ is a valid function or variable name in Javascript.

11. What does href expression <a href="javascript:;"></a> do?

    stackoverflow.com/questions/7755088

    Old thread but thought I'd just add that the reason developers use this construct is not to create a dead link, but because javascript URLs for some reason do not pass references to the active html element correctly. e.g. handler_function(this.id) works as onClick but not as a javascript URL.