Q31. What is the comma operator?
The comma operator is used to evaluate each of its operands from left to right and returns the value of the last operand. This is totally different from comma usage withi...
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Q32. What are the different ways to make an object non-extensible?
You can mark an object non-extensible in 3 ways, 1. `Object.preventExtensions` 2. `Object.seal` 3. `Object.freeze` ```javascript var newObject = {}; Object.preventExtensi...
Q33. How do you extend classes?
The `extends` keyword is used in class declarations/expressions to create a class which is a child of another class. It can be used to subclass custom classes as well as ...
Q34. How do you declare a namespace?
Even though JavaScript lacks namespaces, we can use Objects, an IIFE (Immediately Invoked Function Expression) or `let`/`const` to create namespaces. 1. **Using Object Li...
Q35. Why do you need to avoid with statement?
JavaScript's with statement was intended to provide a shorthand for writing recurring accesses to objects. So it can help reduce file size by reducing the need to repeat ...
Q36. What is destructuring assignment?
The destructuring assignment is a JavaScript expression that makes it possible to unpack values from arrays or properties from objects into distinct variables. Let's get ...
Q37. What are enhanced object literals?
Object literals make it easy to quickly create objects with properties inside the curly braces. For example, it provides shorter syntax for common object property definit...
Q38. What are typed arrays?
Typed arrays are array-like objects from ECMAScript 6 API for handling binary data. JavaScript provides 12 Typed array types, 1. Int8Array: An array of 8-bit signed integ...
Q39. What is for...of statement?
The for...of statement creates a loop iterating over iterable objects or elements such as built-in String, Array, Array-like objects (like arguments or NodeList), TypedAr...
Q40. What is the purpose of Error object?
The Error constructor creates an error object and the instances of error objects are thrown when runtime errors occur. The Error object can also be used as a base object ...