将 Typescript object 推送到 ZD18B8624A0F5F721ZDA7B82365FC562DD 中的 object 数组

Question

I am have a class as follows:

export class Template {
  public Id: Number;
  public FileName: string;
}

The following snippet is from a function where I want to first create an object (of type Template ) and push it to the array. The code breaks at temp.Id with error:

ERROR TypeError: Cannot set property 'Id' of undefined.

The template is initially empty. templates is an array that contains some file names. Array declared as: templateObjects: Template[] = new Array();

for (let i = 0; i < this.templates.length; i++)  {
  var temp: Template;
  temp.Id = i;
  temp.FileName = this.templates[i].toString();
  this.templateObjects.push(temp);
}

Answer 1

u are not newing up Template

let temp is just declaring variable but new initialize it(allocate memory) then u will be able to assign other properties to it

for (let i = 0; i < this.templates.length; i++)  {
  let temp = new Template() ;
  temp.Id = i;
  temp.FileName = this.templates[i].toString();
  this.templateObjects.push(temp);
}