#' ISO quote
#'
#' Takes id of two currencies amd generates an iso Quote.
#' @param curr1 Currency 1.
#' @param curr2 Currency 2.
#' @param base_currs Base currencies.
#' @return iso currency quote.
#' @export
iso_quote <-function(curr1, curr2 = NULL, base_currs = c("NZD", "AUD", "EUR", "GBP")){
if(is.null(curr2)){
iso <- ifelse(curr1 %in% base_currs, paste0(curr1, 'USD'), paste0('USD', curr1))
}else{
iso <- paste0(curr1, curr2)
if(curr1 %in% base_currs){iso <- paste0(curr1, curr2)
}else if (curr2 %in% base_currs){iso <- paste0(curr2, curr1)
}else{
if(curr1 == "USD"){iso <- paste0(curr1, curr2)
}else if (curr2 == 'USD'){iso <- paste0(curr2, curr1)}
}
}
return(iso)
}
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