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#!/usr/bin/env node
// ch-1.js
/*******************************************************************************
* https://theweeklychallenge.org/blog/perl-weekly-challenge-145/
*
* ## Task 1 > Dot Product
* =======================
*
* You are given 2 arrays of the same size, `@a` and `@b`.
*
* Write a script to implement `Dot Product`.
*
* **Example:**
* ```
* @a = (1, 2, 3);
* @b = (4, 5, 6);
*
* $dot_product = (1 * 4) + (2 * 5) + (3 * 6) => 4 + 10 + 18 => 32
* ```
*
******************************************************************************/
'use strict';
/*******************************************************************************
* Dependencies ****************************************************************
******************************************************************************/
const fs = require('fs');
const path = require('path');
/*******************************************************************************
* PWC Solution ****************************************************************
******************************************************************************/
// Input guard
function areSameLengthArrays(arr1 = [], arr2 = []) {
const { isArray } = Array;
return isArray(arr1) && isArray(arr2) && arr1.length === arr2.length;
}
// Solution
function dotProduct(arr1 = [], arr2 = []) {
const badInput = 'dotProduct expects two equal-length arrays as arguments';
if (!areSameLengthArrays(arr1, arr2)) throw new Error(badInput);
return arr1.reduce((sum, multiplicand, idx) => {
const multiplier = arr2[idx];
return sum + multiplicand * multiplier;
}, 0);
}
/*******************************************************************************
* Utilities *******************************************************************
******************************************************************************/
// Checking file types
function isFile(filePath) {
return fs.lstatSync(filePath).isFile();
}
function isDirectory(filePath) {
return fs.lstatSync(filePath).isDirectory();
}
// String transformation
function numArrayFromString(str = '') {
return str.split(',').map((numStr) => parseInt(numStr.trim(), 10));
}
// File handlers
function parseTestCase(filePath = '') {
if (isFile(filePath)) {
try {
const data = fs.readFileSync(filePath, 'utf8');
const lines = data.split('\n');
const badCase = 'Test cases are improperly formatted';
if (!lines.length) throw new Error(badCase);
const testData = lines.filter(
(line) => line.trim().length !== 0 && line.trim().charAt(0) !== '#',
);
const [firstLine, secondLine, testLine] = testData;
const arr1 = numArrayFromString(firstLine);
const arr2 = numArrayFromString(secondLine);
if (!areSameLengthArrays(arr1, arr2)) throw new Error(badCase);
const test = parseInt(testLine.trim(), 10);
if (Number.isNaN(test)) throw new Error(badCase);
return [arr1, arr2, test];
} catch (error) {
return console.log('Problems parsing test cases: ', error);
}
}
console.log(filePath, 'is not a file');
return null;
}
function printArray(arr = []) {
return Array.isArray(arr) && arr.join(', ');
}
function assertDotProduct([arr1 = [], arr2 = [], test], filePath = '') {
try {
const result = dotProduct(arr1, arr2);
const testPath = filePath !== '' ? `${filePath}: ` : '';
console.log(testPath);
console.log(`@a = ${printArray(arr1)}`);
console.log(`@b = ${printArray(arr2)}`);
console.log(`Dot Product: ${result}`);
if (result === test) {
return console.log('\x1b[32m%s\x1b[0m', 'Passed \u2690\n');
}
return console.log('\x1b[31m%s\x1b[0m', 'Failed \u2715\n');
} catch (error) {
return console.log('Something went wrong: ', error);
}
}
/*******************************************************************************
* Test runner *****************************************************************
******************************************************************************/
(function main() {
const testPath = process.argv[2] || '../test_cases/ch-1';
try {
if (isFile(testPath)) {
const testElements = parseTestCase(testPath);
return assertDotProduct(testElements, testPath);
}
if (isDirectory(testPath)) {
return fs.readdirSync(testPath).forEach((fileName) => {
const filePath = path.join(testPath, fileName);
const testElements = parseTestCase(filePath);
return testElements && assertDotProduct(testElements, filePath);
});
}
return console.log('No tests found');
} catch (error) {
return console.log('Something went wrong: ', error);
}
})();
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