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

   stackoverflow.com/questions/784929

   Objects are true, but the undefined value and null are both false. The double negation operator !! calculates the truth value of a value. It's actually two operators, where !!x means !(!x), and behaves as follows: If x is a false value, !x is true, and !!x is false. If x is a true value, !x is false, and !!x is true.

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

   stackoverflow.com/questions/359494

   Reference: JavaScript Tutorial: Comparison Operators. The == operator will compare for equality after doing any necessary type conversions. The === operator will not do the conversion, so if two values are not the same type === will simply return false. Both are equally quick.

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

   stackoverflow.com/questions/61480993

   In short, when you care that let a variable assigned from a possible null undefined source, and you wish to provide a default value to the variable, use the nullish coalescing operator ??. If you want to avoid messing yourself around with the JavaScript definition of falsy truthy [1], then avoid using ||.

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

   stackoverflow.com/questions/846585

   2. "Using the dollar sign is not very common in JavaScript, but professional programmers often use it as an alias for the main function in a JavaScript library. In the JavaScript library jQuery, for instance, the main function $ is used to select HTML elements. In jQuery $ ("p"); means "select all p elements".

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

   stackoverflow.com/questions/35835362

   Functionally, it looks like it allows you to nest a variable inside a string without doing concatenation using the + operator. I'm looking for documentation on this feature. Example: var string = 'this is a string'; console.log(`Insert a string here: ${string}`); javascript. string. variables. concatenation.

8. Difference between == and === in JavaScript - Stack Overflow

   stackoverflow.com/questions/523643

   1210. === and !== are strict comparison operators: JavaScript has both strict and type-converting equality comparison. For strict equality the objects being compared must have the same type and: Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions. Two numbers ...

9. javascript - What does [object Object] mean? - Stack Overflow

   stackoverflow.com/questions/4750225

   In JavaScript there are 7 primitive types: undefined, null, boolean, string, number, bigint and symbol. Everything else is an object. Everything else is an object. The primitive types boolean , string and number can be wrapped by their object counterparts.

10. How to use OR condition in a JavaScript IF statement?

    stackoverflow.com/questions/2363840

    In JavaScript, if you're looking for A or B, but not both, you'll need to do something similar to:

11. How can I check for "undefined" in JavaScript? - Stack Overflow

    stackoverflow.com/questions/3390396

    It's been nearly five years since this post was first made, and JavaScript has come a long way. In repeating the tests in the original post, I found no consistent difference between the following test methods: