Q41. Do all objects have prototypes?
No. All objects have prototypes except two exceptions: * **Object.prototype** itself — This is the base object in the prototype chain, and **its prototype is** `null`. * ...
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Q42. What is the difference between Shallow and Deep copy?
There are two ways to copy an object, **Shallow Copy:** Shallow copy is a bitwise copy of an object. A new object is created that has an exact copy of the values in the o...
Q43. Does javascript uses mixins?
JavaScript does not have built-in support for mixins as a formal language feature. However, developers commonly implement mixins using various patterns to enable code reu...
Q44. How do you display data in a tabular format using console object?
The `console.table()` is used to display data in the console in a tabular format to visualize complex arrays or objects. ```js const users = [ { name: "John", id: 1, city...
Q45. What are wrapper objects?
Primitive Values like string,number and boolean don't have properties and methods but they are temporarily converted or coerced to an object(Wrapper object) when you try ...
Q46. What is heap?
Heap(Or memory heap) is the memory location where objects are stored when we define variables. i.e, This is the place where all the memory allocations and de-allocation t...
Q47. What is a microTask queue?
Microtask Queue is the new queue where all the tasks initiated by promise objects get processed before the callback queue. The microtasks queue are processed before the n...
Q48. How do you detect primitive or non primitive value type?
In JavaScript, primitive types include boolean, string, number, BigInt, null, Symbol and undefined. Whereas non-primitive types include the Objects. But you can easily id...
Q49. How do you make an object iterable in javascript?
By default, plain objects are not iterable. But you can make the object iterable by defining a `Symbol.iterator` property on it. Let's demonstrate this with an example, `...
Q50. What are the differences between spread operator and rest parameter?
Rest parameter collects all remaining elements into an array. Whereas Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/...