How to use the in-built interfaces and type In Typescript

In this approach, first we will define the format of the object inside a interface ot type defined using the respective kerwords. While defining interfaces or type, we will provide the property names and their types inside them and assign them as a explicit type the array.

Syntax:

interface/ type interface_name{
    key1: type1,
    key2: type2,
    key3: type3
}
const array_name: interface_name = [];

Example: The below example will illustarte the use of the interfaces to define an array of objects, you can declare interface as type and can use type also for the same purpose.

Javascript

interface Cricketer {
    cktr_name: string,
    cktr_team: string,
    cktr_runs: number
}
const cktr1 = {
    cktr_name: "Virat Kohli",
    cktr_team: "India",
    cktr_runs: 26000
}
const cktr2 = {
    cktr_name: "AB De Villiers",
    cktr_team: "South Africa",
    cktr_runs: 15000
}
const cktr3 = {
    cktr_name: "David Warner",
    cktr_team: "Australia",
    cktr_runs: 13000
}

const myArr: Cricketer[] = [cktr1, cktr2, cktr3];

myArr.forEach((cktr) => {
    console.log(`Hi, My name is ${cktr.cktr_name},
    I play for ${cktr.cktr_team} and 
    I've already made ${cktr.cktr_runs} 
    runs while representing my country.`)
})

Output:

Hi, My name is Virat Kohli, I play for India and I've already made 26000 runs while representing my country. 
Hi, My name is AB De Villiers, I play for South Africa and I've already made 15000 runs while representing my country. 
Hi, My name is David Warner, I play for Australia and I've already made 13000 runs while representing my country.

How can I Define an Array of Objects in TypeScript?

In TypeScript, the way of defining the arrays of objects is different from JavaScript. Because we need to explicitly type the array at the time of declaration that it will be an Array of objects. In this article, we will discuss the different methods for declaring an array of objects in TypeScript.

There are many methods of declaring an array of objects in TypeScript as listed below: