Typescript "padStart" error when trying to push an object to an array

Question

I declare a object template which I populate with data:

   let dataTemplate = {
       publishedDate: "",
       Url: "",
       Title: "",
     }

     dataTemplate.publishedDate = xml.children[4].children[i].children[13].value;
     dataTemplate.Url = xml.children[4].children[i].children[16].value;
     dataTemplate.Title = xml.children[4].children[i].children[58].value;

I then declare a string array and try to push the above object to the array:

 let data: String[] = [];
 data.push(dataTemplate);

But I get a syntax error at "dataTemplate" at the following line:

data.push(dataTemplate);

[ts]
Argument of type '{ publishedDate: string; Url: string; Title: string; }' is not assignable to parameter of type 'String'.
  Property 'padStart' is missing in type '{ publishedDate: string; Url: string; Title: string; }'.

How come? I use TS 3.3 and cannot uppgrade (MS SPFx does not have support for newer versions.

why are you trying to push object to string array? String array can contain only strings. — Dmytro
– Dmytro, Commented Dec 17, 2020 at 14:56

captain-yossarian from Ukraine · Accepted Answer · 2020-12-17 14:57:06Z

1


/**
 * First of all, define type for templateData
 */
type Template = {
    publishedDate: string;
    Url: string;
    Title: string;
}
let dataTemplate: Template = {
    publishedDate: "",
    Url: "",
    Title: "",
}

/**
 * Wrong. because TS expects array of string, and you are going to use here array of Template
 */
let data: String[] = [];// not ok

// Ok
let data1: Template[] = [];

 data1.push(dataTemplate); // works as expected

answered Dec 17, 2020 at 14:57

captain-yossarian from Ukraine

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