29 lines
751 B
TypeScript
29 lines
751 B
TypeScript
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import { Injectable } from '@nestjs/common';
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const cryptocurrencies = require('cryptocurrencies');
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const customCryptocurrencies = require('./custom-cryptocurrencies.json');
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@Injectable()
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export class CryptocurrencyService {
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private combinedCryptocurrencies: string[];
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public constructor() {}
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public isCrypto(aSymbol = '') {
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const cryptocurrencySymbol = aSymbol.substring(0, aSymbol.length - 3);
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return this.getCryptocurrencies().includes(cryptocurrencySymbol);
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}
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private getCryptocurrencies() {
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if (!this.combinedCryptocurrencies) {
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this.combinedCryptocurrencies = [
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...cryptocurrencies.symbols(),
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...Object.keys(customCryptocurrencies)
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];
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}
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return this.combinedCryptocurrencies;
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}
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}
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