linq-to-typescript

import { from, initializeLinq, IEnumerable } from 'linq-to-typescript'; // 1. Declare that the JS types implement the IEnumerable interface declare global { interface Array<T> extends IEnumerable<T> { } interface String extends IEnumerable<string> { } } // 2. Bind Linq Functions to Array, Map, etc initializeLinq(); async function demonstrateLinq() { console.log('--- Using Wrapper (from) ---'); const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const evenNumbersWrapper = from(numbers) .where((x) => x % 2 === 0) .select((x) => x * 2) .toArray(); console.log('Even numbers doubled (wrapper):', evenNumbersWrapper); // Expected: [4, 8, 12, 16, 20] console.log('\n--- Using Extended Native Types ---'); const oddNumbersNative = numbers.where((x) => x % 2 !== 0).toArray(); console.log('Odd numbers (native extension):', oddNumbersNative); // Expected: [1, 3, 5, 7, 9] console.log('\n--- Async Operations ---'); const asyncData = [10, 20, 30]; const processedAsyncData = await from(asyncData) .selectAsync(async (x) => { await new Promise(res => setTimeout(res, 50)); // Simulate async delay return x + 1; }) .toArray(); console.log('Processed async data:', processedAsyncData); // Expected: [11, 21, 31] } demonstrateLinq();