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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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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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http

method

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

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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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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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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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generating a file of a specific size

mac

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

linux

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A simple, low cost, fast, and secure way to restrict access to an AWS CloudFront Distribution using a CloudFront Edge Function and HTTP Basic Auth.

/**
 * This function is for a viewer request event trigger.
 * Choose viewer request for event trigger when you associate this function with a distribution.
 */
function handler(event) {
  if (!event.request.headers.authorization) return respond401();
 var auth = event.request.headers.authorization.value;

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Read more about using the official Node.js docker image.

running a file

Quickly execute a node script in a fresh docker container using the command below.

The current directory where the command is run will be mounted into the container as a volume.

docker run -it --rm --name my-running-script \

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DynamoDB Item Size Limit Checker

A quick utility for checking whether you should store an item in DynamoDB.

DynamoDB currently limits each item stored to a maximum of 400KB.

Continue reading to explore how to check if a payload you plan to store falls under the 400KB DynamoDB item size limit.

There are two approaches for this: