How to initialize a typed array in Typescript

Question

I have an array called "cart" of objects which looks like this,

cart:[{name:any, rate:number, qty:number, discount:number, subtotal:number}]

and I don't want to have any data in it at the beginning, but when I write

cart:[{name:any, rate:number, qty:number, discount:number, subtotal:number}];

and try to find the length by using

Object.keys(this.cart).length

it shows an error saying

`TypeError: Cannot convert undefined or null to object`

Also, how to clear all elements in an Array.

Muthukumar · Accepted Answer · 2017-10-09 06:07:00Z

11

Based on my understanding, the following should work for you,

interface ISomething {
    name: any;
    rate: number;
    qty: number;
    discount: number;
    subtotal: number
}
let cart: Array<ISomething> = [];

answered Oct 9, 2017 at 6:07

Muthukumar

9,73918 gold badges67 silver badges87 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

hakanostrom · Accepted Answer · 2017-10-09 05:48:28Z

0

You need to first initialize the array:

cart = [];

Also, do this to clear all elements in the array.

edited Oct 9, 2017 at 5:48

answered Oct 9, 2017 at 5:45

hakanostrom

1,0818 silver badges15 bronze badges

Collectives™ on Stack Overflow

How to initialize a typed array in Typescript

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related