Q441. List down the collection of methods available on WeakSet
Below are the list of methods available on `WeakSet`, 1. `add(value)`: A new object is appended with the given value 2. `delete(value)`: Deletes the value from the collec...
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Q442. 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. ...
Q443. 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...
Q444. List down the collection of methods available on WeakMap
Below are the list of methods available on `WeakMap`, 1. `set(key, value)`: Sets the value for the key in the `WeakMap` object. Returns the `WeakMap` object. 2. `delete(k...
Q445. What is the purpose of uneval?
The `uneval()` is an builtin function which is used to create a string representation of the source code of an Object. It is a top-level function and is not associated wi...
Q446. How do you encode an URL?
The `encodeURI()` function is used to encode complete URI which has special characters except (, / ? : @ & = + $ #) characters. ```javascript var uri = "https://mozilla.o...
Q447. How do you decode an URL?
The `decodeURI()` function is used to decode a Uniform Resource Identifier (URI) previously created by `encodeURI()`. ```javascript var uri = "https://mozilla.org/?x=шелл...
Q448. How do you print the contents of web page?
The `window` object provides a `print()` method which is used to print the contents of the current window. It opens a Print dialog box which lets you choose between vario...
Q449. What is the difference between uneval and eval?
The `uneval` function returns the source of a given object; whereas the `eval` function does the opposite, by evaluating that source code in a different memory area. Let'...
Q450. What is an anonymous function?
An anonymous function is a function without a name! Anonymous functions are commonly assigned to a variable name or used as a callback function. The syntax would be as be...