How to assign object to array in Typescript

Question

i have a class in Typescript and i am having problem assigning in the this. part of the class. I am getting the folowing error. Type 'ListingHistory' is missing the following properties from type 'ListingHistory[]': length, pop, push, concat, and 26 more.ts(2740)

below is my class with the this section

export class History {
    public address: string;
    public listingHistory: ListingHistory[];
    public saleHistory: SaleHistory[] ;
    public mortgageHistory: MortgageHistory[];

    constructor(address: string, listingHistory?: ListingHistory, saleHistory ?: SaleHistory ,
                mortgageHistory?: MortgageHistory) {

       this.address = address;
       this.listingHistory = listingHistory;
       this.saleHistory(push)saleHistory;
       this.mortgageHistory = mortgageHistory;

}

Niall Moore · Accepted Answer · 2019-04-15 01:07:51Z

1

you are passing a nullable listingHistory to the constructor you might need to initialise the listingHistory field

export class History {
public address: string;
public listingHistory: ListingHistory[];
public saleHistory: SaleHistory[];
public mortgageHistory: MortgageHistory[];

constructor(address: string, listingHistory?: ListingHistory, saleHistory ?: SaleHistory ,
            mortgageHistory?: MortgageHistory[]) {

   this.address = address;
   this.listingHistory = listingHistory || [];
   this.saleHistory = saleHistory || [];
   this.mortgageHistory = mortgageHistory || [];

}

edited Apr 15, 2019 at 1:07

Niall Moore

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answered Apr 14, 2019 at 23:56

Nerdroid

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Comments

Ikechukwu Eze · Accepted Answer · 2019-04-14 23:51:24Z

0

You created an array of ListingHistory but passing a single ListingHistory item to your constructor

export class History {
public address: string;
public listingHistory: ListingHistory[];
public saleHistory: SaleHistory[] ;
public mortgageHistory: MortgageHistory[];

constructor(public address: string, public listingHistory?: ListingHistory[], public saleHistory ?: SaleHistory[],
            public mortgageHistory?: MortgageHistory[]) {

   this.address = address;
   this.listingHistory = listingHistory;
   this.saleHistory(push)saleHistory;
   this.mortgageHistory = mortgageHistory;

 }

edited Apr 14, 2019 at 23:51

answered Apr 14, 2019 at 23:35

Ikechukwu Eze

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2 Comments

Ikechukwu Eze Over a year ago

@MisterniceGuy I have just edited it, hope it works fine now

Travis Haby Over a year ago

What are you passing into the History class's listingHistory attribute when you initialize it? From the error, it seems like you are not passing an array-like object....might you be passing one ListingHistory instead of an array of ListingHistory[] ?

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