Hoping for a clean way to get an array of filenames in directory

Trying to do something like this:

const files = Deno.readDirSync(Deno.cwd()).map(x => x.name);

const files = Deno.readDirSync(Deno.cwd()).map(x => x.name);

But I get this: Property 'map' does not exist on type 'Iterable<DirEntry>'. Is a for loop the only way?

6 Replies

Ayo Reis•6mo ago

You could turn the iterable into an array with Array.from and then map it, if memory is not a concern.

NDH•6mo ago

let files = [];
for await (const entry of Deno.readDirSync(Deno.cwd())) {
   if (entry.isFile) files.push(entry.name);
}

let files = [];
for await (const entry of Deno.readDirSync(Deno.cwd())) {
   if (entry.isFile) files.push(entry.name);
}

duncanmak•6mo ago

This is also kinda interesting: https://github.com/tc39/proposal-iterator-helpers https://www.npmjs.com/package/es-iterator-helpers

GitHub

GitHub - tc39/proposal-iterator-helpers: Methods for working with i...

Methods for working with iterators in ECMAScript. Contribute to tc39/proposal-iterator-helpers development by creating an account on GitHub.

npm

es-iterator-helpers

An ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.. Latest version: 1.0.15, last published: 4 months ago. Start using es-iterator-helpers in your project by running npm i es-iterator-helpers. There are 75 other projects in the npm registry using es-iterator-helpers.

javi•6mo ago

You can use <Array>.fromAsync

const result = (await Array.fromAsync(Deno.readDir(Deno.cwd()))).filter(({ isFile }) => isFile);

const result = (await Array.fromAsync(Deno.readDir(Deno.cwd()))).filter(({ isFile }) => isFile);

Or go over the board with fp-ts, which is way more readable

import { task, function as func } from "npm:fp-ts"

const result = await func.pipe(
  Deno.cwd(),
  Deno.readDir,
  Array.fromAsync,
  task.of,
  task.map((files) => files.filter(({ isFile }) => isFile)),
  (fn) => fn()
)

import { task, function as func } from "npm:fp-ts"

const result = await func.pipe(
  Deno.cwd(),
  Deno.readDir,
  Array.fromAsync,
  task.of,
  task.map((files) => files.filter(({ isFile }) => isFile)),
  (fn) => fn()
)

Leokuma•6mo ago

import { walkSync } from "https://deno.land/std@0.213.0/fs/walk.ts"

const files = walkSync('.', {maxDepth: 1})

import { walkSync } from "https://deno.land/std@0.213.0/fs/walk.ts"

const files = walkSync('.', {maxDepth: 1})

https://deno.land/std@0.213.0/fs/mod.ts?s=WalkOptions

Quantum•6mo ago

Thanks everyone! Also, walk is awesome. 🙂