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e706de2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | /**
* Solution 1: Multiplier Runnable
*
* This solution demonstrates:
* - Extending the Runnable base class
* - Storing configuration in constructor
* - Implementing the _call() method
* - Input validation
*/
import { Runnable } from '../../../../src/index.js';
/**
* MultiplierRunnable - Multiplies input by a factor
*/
class MultiplierRunnable extends Runnable {
constructor(factor) {
super(); // Always call super() first!
// Validate factor
if (typeof factor !== 'number') {
throw new Error('Factor must be a number');
}
this.factor = factor;
}
async _call(input, config) {
// Validate input
if (typeof input !== 'number') {
throw new Error('Input must be a number');
}
// Perform multiplication
return input * this.factor;
}
// Optional: Override toString for better debugging
toString() {
return `MultiplierRunnable(×${this.factor})`;
}
}
// ============================================================================
// Tests
// ============================================================================
async function runTests() {
console.log('🧪 Testing MultiplierRunnable Solution...\n');
try {
// Test 1: Basic multiplication
console.log('Test 1: Basic multiplication');
const times3 = new MultiplierRunnable(3);
const result1 = await times3.invoke(5);
console.assert(result1 === 15, `Expected 15, got ${result1}`);
console.log('✅ 3 × 5 = 15');
console.log(` Runnable: ${times3.toString()}\n`);
// Test 2: Different factor
console.log('Test 2: Different factor');
const times10 = new MultiplierRunnable(10);
const result2 = await times10.invoke(7);
console.assert(result2 === 70, `Expected 70, got ${result2}`);
console.log('✅ 10 × 7 = 70\n');
// Test 3: Negative numbers
console.log('Test 3: Negative numbers');
const times2 = new MultiplierRunnable(2);
const result3 = await times2.invoke(-5);
console.assert(result3 === -10, `Expected -10, got ${result3}`);
console.log('✅ 2 × -5 = -10\n');
// Test 4: Decimal numbers
console.log('Test 4: Decimal numbers');
const times1_5 = new MultiplierRunnable(1.5);
const result4 = await times1_5.invoke(4);
console.assert(result4 === 6, `Expected 6, got ${result4}`);
console.log('✅ 1.5 × 4 = 6\n');
// Test 5: Zero
console.log('Test 5: Multiply by zero');
const times0 = new MultiplierRunnable(0);
const result5 = await times0.invoke(100);
console.assert(result5 === 0, `Expected 0, got ${result5}`);
console.log('✅ 0 × 100 = 0\n');
// Test 6: Error handling - invalid factor
console.log('Test 6: Error handling - invalid factor');
try {
new MultiplierRunnable('not a number');
console.error('❌ Should have thrown error');
} catch (error) {
console.log('✅ Correctly throws error for invalid factor\n');
}
// Test 7: Error handling - invalid input
console.log('Test 7: Error handling - invalid input');
try {
const times5 = new MultiplierRunnable(5);
await times5.invoke('not a number');
console.error('❌ Should have thrown error');
} catch (error) {
console.log('✅ Correctly throws error for invalid input\n');
}
// Test 8: Works with batch
console.log('Test 8: Batch processing');
const times2_batch = new MultiplierRunnable(2);
const results = await times2_batch.batch([1, 2, 3, 4, 5]);
console.log(` Input: [1, 2, 3, 4, 5]`);
console.log(` Output: [${results.join(', ')}]`);
console.assert(JSON.stringify(results) === JSON.stringify([2, 4, 6, 8, 10]));
console.log('✅ Batch processing works\n');
console.log('🎉 All tests passed!');
} catch (error) {
console.error('❌ Test failed:', error.message);
console.error(error.stack);
}
}
// Run tests
if (import.meta.url === `file://${process.argv[1]}`) {
runTests();
}
export { MultiplierRunnable }; |