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home / developersection / interviews / what is the generic and non generic collections?
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Shrikant Mishra
Shrikant Mishra

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2 Answers

Aryan Kumar
Aryan Kumar 07 Jun 2023
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Generic collections are collections that can hold elements of any type. This is in contrast to non-generic collections, which can only hold elements of a specific type.

Generic collections are introduced in JavaScript ES2015. They are implemented using the class keyword.

Here is an example of a generic collection:

Code snippet

class MyCollection<T> {
  constructor() {
    this.items = [];
  }

  add(item: T) {
    this.items.push(item);
  }

  get items() {
    return this.items;
  }
}

This class can be used to create a collection that can hold elements of any type. For example, you could create a collection of strings or a collection of numbers.

Non-generic collections are collections that can only hold elements of a specific type. This is the older way of creating collections in JavaScript.

Here is an example of a non-generic collection:

Code snippet

var myArray = [];

myArray.push("Hello");
myArray.push(123);

This code creates an array that can hold elements of any type. However, it is not type-safe. This means that you could accidentally add an element of the wrong type to the array.

Generic collections are preferred over non-generic collections because they are type-safe. This means that you can be sure that the elements in a generic collection are of the correct type. This can help to prevent errors and improve the performance of your code.

Here is a table of the differences between generic and non-generic collections:

Feature Generic collections Non-generic collections
Type-safety Yes No
Performance Better Worse
Flexibility More flexible Less flexible

It is important to note that generic collections are not supported by all browsers. If you need to support older browsers, you may need to use non-generic collections.

Shrikant Mishra
Shrikant Mishra 05 Oct 2019
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These are two types of collections one is generic collection another one is non-generic collection.

Generic Collection:

Into this, We can group one type of object in a single collection is called generic collection. Here we don't need to convert a particular type like string, int, etc.

Non Generic Collection:

Into this, We can group any type of object in a single collection is called non-generic collection. Here we need to convert a particular type like string, int,etc., otherwise, we will face issues in run time.

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