In Angular, when performing an arithmetic operation, the left operand must be either of type 'any', 'number', 'bigint', or an enum type

I have developed TypeScript code to compute the percentages of firms and insights and exhibit them using a progress bar. The following snippet contains the code:

export class InsightsComponent implements OnInit {
  insights: any;
  firm: Firm;

  constructor(
    private firmService: FirmService,
    private provider: FirmProvider,
    private http: HttpClient,
  ) {}

  ngOnInit(): void {
    this.provider.getInsights(this.firmService.getDomain())
      .then(data => {
        console.log(data);
        this.insights = data;
      });
    this.provider.getCurrent(this.firmService.getDomain())
      .then(data => {
        this.firm = data;
      });
  }

  calcInvoiced = (firm: Firm, insights: number) => {
    ((this.firm / this.insights) * 100).toFixed(2);
  }
}

Would you be able to offer feedback on potential enhancements and optimizations for this piece of code?

Answer №1

In order to properly execute your arithmetic operation, it is essential to assign it to a variable or ensure that the result is returned.

    calculateInvoiced = (company: Company, data: number) => {
         return ((this.company / this.data) * 100).toFixed(2);
  }

this.company / this.data may cause issues if this.company is not in numerical form.

Answer №2

There are several ways to streamline your code:

  1. If you only need the final calculated value and not the individual variables "insights" and "firm", you can create a new promise and utilize it in your template by employing the async operator as shown below. This will ensure a one-time calculation during initialization.
invoiced = Promise.all([
  this.provider.getInsights(this.firmService.getDomain()),
  this.provider.getCurrent(this.firmService.getDomain()),
]).then(([insights, firm]) => ((firm / insights) * 100).toFixed(2));
  1. If you require other variables as well, I recommend returning observables directly from the service, storing them in properties, and utilizing the combineLatest operator from rxjs (here) to derive the invoiced variable. You can then use the async pipe to consume these values.

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