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Normalize currency code: edits per review

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This commit is contained in:
mDuo13
2022-06-15 13:23:06 -07:00
parent 581a02c847
commit 1c760de003
1 changed files with 19 additions and 13 deletions
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32
content/_code-samples/normalize-currency-codes/js/normalize-currency-code.js
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@@ -10,19 +10,6 @@
// This code is intended for use with Node.js.
////////////////////////////////////////////////////////////////////////////////
function convertDemurrageToUTF8(demurrageCode) {
let bytes = Buffer.from(demurrageCode, "hex")
let code = String.fromCharCode(bytes[1]) + String.fromCharCode(bytes[2]) + String.fromCharCode(bytes[3]);
let interest_start = (bytes[4] << 24) + (bytes[5] << 16) + (bytes[6] << 8) + (bytes[7]);
let interest_period = bytes.readDoubleBE(8);
const year_seconds = 31536000; // By convention, the XRP Ledger's interest/demurrage rules use a fixed number of seconds per year (31536000), which is not adjusted for leap days or leap seconds
let interest_after_year = Math.pow(Math.E, (interest_start+year_seconds - interest_start) / interest_period)
let interest = (interest_after_year * 100) - 100;
return(`${code} (${interest}% pa)`)
}
function normalizeCurrencyCode(currencyCode, maxLength = 20) {
if(!currencyCode) return "";
@@ -55,6 +42,25 @@ function normalizeCurrencyCode(currencyCode, maxLength = 20) {
return "";
}
function convertDemurrageToUTF8(demurrageCode) {
let bytes = Buffer.from(demurrageCode, "hex")
let code = String.fromCharCode(bytes[1]) + String.fromCharCode(bytes[2]) + String.fromCharCode(bytes[3]);
let interest_start = (bytes[4] << 24) + (bytes[5] << 16) + (bytes[6] << 8) + (bytes[7]);
let interest_period = bytes.readDoubleBE(8);
const year_seconds = 31536000; // By convention, the XRP Ledger's interest/demurrage rules use a fixed number of seconds per year (31536000), which is not adjusted for leap days or leap seconds
let interest_after_year = Math.pow(Math.E, (interest_start+year_seconds - interest_start) / interest_period)
let interest = (interest_after_year * 100) - 100;
return(`${code} (${interest}% pa)`)
}
console.log("Standard 3-character code (should be 'USD')")
console.log(normalizeCurrencyCode("USD"))
console.log("Currency code that decodes to XRP, case-insensitive (should be empty string)")
console.log(normalizeCurrencyCode("xRp"))
console.log("Demurrage code (should be 'XAU (-0.5% pa)')...")
console.log(normalizeCurrencyCode("0158415500000000C1F76FF6ECB0BAC600000000"))