word-count.js in JavaScript

A complete word-frequency script: read a file, normalize, tally, report.

import { readFile } from "node:fs/promises";
import process from "node:process";

async function wordCount(path) {
  const text = await readFile(path, "utf8");
  const counts = new Map();
  for (const raw of text.split(/\s+/)) {
    const word = raw.replace(/[.,!?;:]/g, "").toLowerCase();
    if (word) counts.set(word, (counts.get(word) || 0) + 1);
  }
  return [...counts.entries()].sort((a, b) => b[1] - a[1]);
}

const path = process.argv[2];
if (!path) {
  console.error("usage: node word-count.js FILE");
  process.exit(1);
}
for (const [word, count] of (await wordCount(path)).slice(0, 10)) {
  console.log(String(count).padStart(6), word);
}

Keywords and builtins used here

Map
String
async
await
const
for
from
function
if
import
of
return

The run, in numbers

Lines: 21
Characters to type: 626
Tokens: 196
Three-star pace: 105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 112 seconds.

Type this snippet

Step 1 of 1 in Encore, step 43 of 43 in Language basics.

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