Learn TypeScript 3 by Building Web Applications

Implementing the other methods

You can, in fact, very easily implement the rest of the methods for the indicator API calls.

Here's a utility function that will heavily simplify the implementation of our contract:

async getIndicatorData(indicator: WorldBankApiV2Indicators, country: Country, dateRange: string, perPage: number): Promise<DataPoint[]> {
    const response: Response = await fetch(`${this.getBaseIndicatorApiUrlFor(indicator, country)}?${WorldBankApiV2Params.FORMAT}=${WorldBankApiV2Formats.JSON}&${WorldBankApiV2Params.PER_PAGE}=${perPage}&${WorldBankApiV2Params.DATE}=${dateRange}`);    const checkedResponse: Response = await      this.checkResponseStatus(response);
    let jsonContent: unknown = await      this.getJsonContent(checkedResponse); const ...