Q21. What is the purpose of using object is method?
Some of the applications of Object's `is` method are follows, 1. It is used for comparison of two strings. 2. It is used for comparison of two numbers. 3. It is used for ...
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Q22. How do you copy properties from one object to other?
You can use the `Object.assign()` method which is used to copy the values and properties from one or more source objects to a target object. It returns the target object ...
Q23. What are the applications of the assign method?
Below are the some of main applications of `Object.assign()` method, 1. It is used for cloning an object. 2. It is used to merge objects with the same properties.
Q24. What are the applications of the seal method?
Below are the main applications of `Object.seal()` method, 1. It is used for sealing objects and arrays. 2. It is used to make properties of an object non-configurable.
Q25. What is a WeakSet?
A `WeakSet` is used to store a collection of weakly(weak references) held objects. The syntax would be as follows, ```javascript new WeakSet([iterable]); ``` Let's see th...
Q26. What are the differences between WeakSet and Set?
The main difference is that references to objects in `Set` are strong while references to objects in `WeakSet` are weak. i.e, An object in `WeakSet` can be garbage collec...
Q27. What is a WeakMap?
A `WeakMap` object is a collection of key/value pairs in which the keys are weakly referenced. In this case, keys must be objects and the values can be arbitrary values. ...
Q28. What are the differences between WeakMap and Map?
The main difference is that references to key objects in `Map` are strong while references to key objects in `WeakMap` are weak. i.e, A key object in `WeakMap` can be gar...
Q29. How do you perform language specific date and time formatting?
You can use the `Intl.DateTimeFormat` object which is a constructor for objects that enable language-sensitive date and time formatting. Let's see this behavior with an e...
Q30. What are the properties of the Intl object?
Below are the list of properties available on the `Intl` object, 1. **Collator:** These are the objects that enable language-sensitive string comparison. 2. **DateTimeFor...