There is no index signature that includes a parameter of type 'number' on the specified type xx

Here are the data types I am currently utilizing:

export interface IHelpDeskTextData {
  supportPaneltext: ContactHelpdeskContex[];
  selected?: number | null;
  brandOptions?: string[];
  textPanel?: ITextPanel[];
}

export class ContactHelpdeskContex {
  public brand: string;
  public paragraphList: IParagraph[];
}
interface IParagraph {
  rowList: string[];
}

export interface ITextPanel {
  textContent: IParagraph[];
  selected: boolean;
  brand: string;
}

I have variables containing data of the following types:

public supportPaneltext: ContactHelpdeskContex[];
public textPanel: ITextPanel[] = [];

I attempted to create a new variable using the map function on the above variable:

public getLabel() {
    if (!this.supportPaneltext) {
      return;
    }

    this.textPanel = Object.values(this.supportPaneltext).map((item,i) => {
      return {
        brand: item[i].brand,
        selected: false,
        textContent: item[i].paragraphList
      }}
      )}

Unfortunately, I encountered an error when trying to use the index [i]:

Element implicitly has an 'any' type because expression of type 'number' can't be used to index type 'ContactHelpdeskContex'.
  No index signature with a parameter of type 'number' was found on type 'ContactHelpdeskContex'.

What could be the cause of this issue, and how can it be resolved?

Answer №1

The reason for this error is because you are trying to index ContactHelpdeskContex with i in the following way: item[i].brand. The issue arises from the fact that the value passed to the .map() method (item in this case) is a specific element of the array, not the array itself. You can learn more about how map works here.

To fix this, simply remove [i]

public getLabel() {
    if (!this.supportPaneltext) {
        return;
    }

    this.textPanel = Object.values(this.supportPaneltext).map(item => ({
        brand: item.brand,
        selected: false,
        textContent: item.paragraphList
    }))
}

Answer №2

First of all, there is no need to utilize Object.values for looping through an array. Secondly, since you already have the array element stored in item, you can omit using the index variable i:

this.textPanel = this.supportPaneltext.map((item) => {
      return {
        brand: item.brand,
        selected: false,
        textContent: item.paragraphList
      }
      }
      )

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