Function getExchageRate

Return exchange rate to passed currencies pair

getExchageRate(source, target, exchangeRates): string
Parameters
- source: string
  Source currency code
- target: string
  Target currency code
- exchangeRates: ExchangeRates
  Exchange rates information from Store.getExchangeRates method
Returns string
Exchange rate or zero, if currencies pair not exists
- Defined in helpers/utils.ts:332