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nested generics typescript

Codeimpressive answered on April 17, 2023 Popularity 5/10 Helpfulness 1/10

answer nested generics typescript

nested generics typescript

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Nested generics in TypeScript refer to the use of one or more generic types as a parameter
or return value of another generic type. This is a powerful feature that allows you to write
more flexible and reusable code.

Here's an example of nested generics in TypeScript:


interface Box<T> {
  value: T;
}

interface Container<T> {
  boxes: Box<T>[];
}

function getFirstBoxValue<T>(container: Container<T>): T {
  return container.boxes[0].value;
}

const containerOfStringBoxes: Container<string> = {
  boxes: [
    { value: 'Hello' },
    { value: 'World' },
  ],
};

const firstBoxValue = getFirstBoxValue(containerOfStringBoxes);
console.log(firstBoxValue); // Output: Hello

In this example, we define two generic interfaces: Box and 'Container'. The 'Box'
interface has a single generic type parameter 'T', which is used as the type of its 'value'
property. The 'Container' interface also has a single generic type parameter 'T', which is
used as the type of its 'boxes' property, which is an array of 'Box<T>'.

We then define a generic function 'getFirstBoxValue'', which takes a 'Container<T>'
object as an argument and returns the value of the first 'Box<T>' 
object in its 'boxes' array.

Finally, we create an instance of 'Container<string>' and call 'getFirstBoxValue' with it.
The function correctly returns the value of the first Box<string> object in the 'boxes'
array, which is 'Hello'.

Nested generics in TypeScript can be a bit complex, but they are a powerful feature that can
help you write more flexible and reusable code. By using nested generics, you can create
highly abstract data structures and functions that can work with a wide range of types,
making your code more modular and easier to maintain.

Popularity 5/10 Helpfulness 1/10 Language typescript

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Contributed on Apr 17 2023

Codeimpressive

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nested generics typescript

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