typescript array of property of object code example

Example 1: array objects to array of one property

let result = objArray.map(a => a.foo);

Example 2: typescript array of objects

//Define an interface to standardize and reuse your object
interface Product {
    name: string;
    price: number;
    description: string;
}

let pen: Product = {
  name: "Pen",
  price: 1.43,
  description: "Userful for writing"
}

let products: Product[] = [];
products.push(pen);
//...do other products.push(_) to add more objects...
console.log(products);
/* -->
*[
* {
*  name: "Pen",
*  price: 1.43,
*  description: "Userful for writing"
* },
* ...other objects...
*]

Example 3: map a property from array of objects javascript

var result = objArray.map(function(a) {return a.foo;});

Example 4: typescript array of objects

interface User {
	[index: number]: {
    	firstname: string;
      	lastname: string;
      	age: number;
    }
}