Array within an other array

Question

I have an object of array ( form an API ), eatch object contains an array and i can't get access to the sub array:

Structure:

Billing [date, totalPrice, {productList[product1,product2]}, ..., ..., {[...,...,...]},....,....,..., {[...,...,...,]}]

My Model is:

export  class Billing {
  private _productsList: Array<InvoiceLine>;
  private _Date: Date;
  private _totalPrice: number;
}

Then I initialized an my array:

public AllBilling: Billing[] = [];

Then when I try to get my data from Blling Array it works.

for ( i = 0; i < this.AllBilling.length; i++){
     console.log(this.AllBilling);
}

But when I try to get productsList form my array it doesn't work.

for ( i = 0; i < this.Belling.length; i++){
     console.log(this.Belling[i]);

        for ( j = 0; j < this.AllBilling[i].productsList.length; i++){
          console.log(this.AllBilling[i].productsList[j]); }
}

It gives me the folowing error:

ERROR TypeError: Cannot read property 'length' of undefined

witch refer to productsList.length

enter image description here

Nguyen Phong Thien · Accepted Answer · 2019-02-18 11:13:39Z

3

You have several mistakes in this code

what you need to repeat is AllBilling, not Belling, Belling refers to a class, not a value
_productsList not productsList
If you want to access productsList, it should be public, not private

That's why it was not working. Hope this help

answered Feb 18, 2019 at 11:13

Nguyen Phong Thien

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4 Comments

NiVeR Over a year ago

Point 3 is not a should, it is just a suggestion, since javascript will still be able to access the field directly

Nguyen Phong Thien Over a year ago

It's correct. However, if you mark it as private, it'll throw an error when you build it, or even in the IDE. Since you use TypeScript, you should follow it, otherwise it doesn't make sense

Nguyen Phong Thien Over a year ago

and "should" is a suggestion, isn't it :D, not "must"

NiVeR Over a year ago

It will throw an error if you have the option –noEmitOnError

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