Keywords are reserved words that are part of the syntax in the programming language. For example, const a = ‘hello’; Here, const is a keyword that denotes that a is a constant.
- Popularity. …
- Interoperability. …
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- Gives the ability to create rich interfaces.
Why ! Is false?
! evaluates to false because the reference is truthy.  can be converted to an number (0 in this case) which is falsey. Therefore: the condition passes as equal.
=== (or !== ) is another comparison operator that checks if the value of something is equal to the value of, and is the same type as something else. e.g. if(x === 1) will evaluate to true however, if(x === true) will evaluate to false because 1 (the value of x ) is an integer and true is a boolean.
What is three dots in JS?
The super keyword is used to access and call functions on an object’s parent. The super. prop and super[expr] expressions are valid in any method definition in both classes and object literals.