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generating a file of a specific size

mac

mkfile -n 2g ~/some/file.txt

linux

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If you run CMD+T on a Mac when the calculator is opened and focused, it will toggle the "Paper Tape" window for the calculator, which displays a history of the calculations you've performed.

A nice feature that I just found (accidentally).

Most recently tested on macOS Big Sur Version 11.4

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jupyter-notebook

Quickly spin up a Jupyter notebook for data science experiments.

It is easy with Docker!

docker run --rm \
-p 8888:8888 \
-v "${PWD}":/home/jovyan/work \

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An example of a TypeScript Method Decorator, also known as an "annotation" in other languages.

You can use a decorator like @Decorator on a method inside of a class.

export function Decorator <Args extends any[], Result extends any> (target: Object, propertyKey: string, descriptor: TypedPropertyDescriptor<(...args: Args) => Result>) {
  const originalMethod = descriptor.value // save a reference to the original method
  // NOTE: Do not use arrow syntax here. Use a function expression in 
  // order to use the correct value of `this` in this method (see notes below)
  if (originalMethod) {

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http

method

export type Method =
  | 'get'
  | 'options'
  | 'post'
 | 'put'

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A simple live-reload implementation that refreshes the page when the source file changes on disk.

The server.js file just serves the files in the directory that it is in, including itself. It also ensures that a private Cache-Control header is set for GET requests, and caching disabled for other HTTP methods.

The index.html file contains a hand-rolled live-reload script that polls the server every 2 seconds and honors the HTTP 304 response code and the caching and etag directives specified by

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typed-string-splitter

What the built-in string 'some cool string'.split(' ') does:

--> converts 'some cool string' to ['some', 'cool', 'string'] with a resulting type of string[]

What you can do with TypedSplit('some cool string', ' ') from this gist:

--> converts 'some cool string' to ['some', 'cool', 'string'] with a resulting type of ['some', 'cool', 'string']

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// make sure you `npm install twilio` before you run

const config = {
  // get your credentials from the twilio console: www.twilio.com/console
  // can also be configured as environment variables instead
  accountSid: '<twilio account sid>',
  authToken: '<twilio auth token>',
  // on a twilio trial account, you can only send from and to confirmed or purchased numbers
  // upgrade your account to send to any number
  from: '+10000000000',

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unzipping a .gz file

On Linux and MacOS, a .gz file can be decompressed using the gzip command.

For example:

gzip -d log.gz

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# https://stackoverflow.com/questions/3349105/how-to-set-current-working-directory-to-the-directory-of-the-script-in-bash

cd "${0%/*}"