custom-word-count/src/index.mjs

A cli tool which counts word in a given file or count a specific word count when provided in argument.

import { readFile } from 'fs/promises';

const validString = (str) => {
 return (typeof str === 'string' && str.trim().length > 0) ? true : false;
}

const filePath = process.argv[2];
const searchInputWord = process.argv[3];

if (validString(filePath)) {
    const words = await readFile(filePath, 'utf-8');
    const wordArray = words.split(/\W/).filter(w => w);
    let wordCount = {};

    // Check if 'search word' is specified
    if(validString(searchInputWord)){
        wordCount[searchInputWord] = wordArray.reduce((count, item) => {
            return (item.toLowerCase() === searchInputWord.toLowerCase()) ? count + 1 : count;
        }, 0);
    }else{
        wordCount = wordArray.reduce((acc, word) => {
            acc[word] = (acc[word] || 0) + 1;
            return acc;
        }, {});
    }
    console.log(wordCount);
}else {
    console.log('Please specify the correct file path!!!');
}