ariesmcrae

Typescript: How to parse a unix epoch date using date-fns library

  // npm install date-fns date-fns-tz
  
  import { fromUnixTime, } from 'date-fns';
  import { utcToZonedTime, format as utcFormat } from 'date-fns-tz';

  // Unix epoch timestamp is a string in milliseconds in UTC
  const unixTimestampString = '1692761130000'; // 2023-08-23 03:25:30.000Z

ariesmcrae

Typescript: Date comparison using date-fns

import { compareAsc, parseISO } from 'date-fns';

type UltraMarathoner = {
  id: string;
  name: string;
  finishTime: string;
};

ariesmcrae

Typescript: Basic auth (username/password) with Axios

// npm install axios

import axios, { AxiosInstance } from 'axios'

const axiosInstance: AxiosInstance = axios.create({
  baseURL: 'https://jsonplaceholder.typicode.com',
 timeout: 3000,

ariesmcrae

Typescript: Find an item from one list to another

Version 1: the imperative approach

type Item = {
  id: string
  name: string
}

const items1: Item[] = [

ariesmcrae

The importance of dependency injection

Say you have a class named AbcClass.

If AbcClass depends on AnotherClass, and AnotherClass eventually needs to make a network call (e.g. to S3, Databse, GIS, some other party), then don't instantiate AnotherClass inside AbcClass. AnotherClass should be injected into the constructor of AbcClass.

Why? Here's the reason why:

Say AnotherClass is instantiated inside AbcClass. When you write a test for AbcClass, AnotherClass will inevitably make a network call.

ariesmcrae

branch prefix	desc	touches prod code
+:refs/heads/(feature/*)	add new feature	Y
+:refs/heads/(fix/), +:refs/heads/(hotfix/)	bug fix	Y
+:refs/heads/(refactor/*)	change code.e.g. renaming a variable	Y
+:refs/heads/(docs/*)	changes to docs	N
+:refs/heads/(style/*)	formatting, missing semi colons	N
+:refs/heads/(test/*)	adding missing tests, refactoring tests	N
+:refs/heads/(chore/*)	updating build scripts	N

ariesmcrae

Typescript: Convert current date object to UTC string using the 'date-fns-tz' library

// npm i date-fns-tz

import { utcToZonedTime, format as utcFormat } from 'date-fns-tz'

const main = async (): Promise<void> => {
  const dateInUtc: Date = utcToZonedTime(new Date(), 'UTC')
 const formattedDateInUTC = utcFormat(dateInUtc, 'yyyy-MM-dd\'T\'HH:mm:ss\'Z\'', { timeZone: 'UTC' })

ariesmcrae

npm i @mapbox/polyline

npm i -D @types/mapbox__polyline

import * as polyline from '@mapbox/polyline';

/**
* coords is encoded using the Google Maps algorithm for polyline encoding. See
* https://developers.google.com/maps/documentation/utilities/polylinealgorithm
* Use this for decoding https://www.npmjs.com/package/@mapbox/polyline

ariesmcrae

Sign git commits with GPG

1. For macOS, brew install gnupg

2. Follow instructions here https://docs.gitlab.com/ee/user/project/repository/signed_commits/gpg.html

3. Your .gitconfig should look like this:

[user]

ariesmcrae

Pyenv will allow you to switch to different versions of python locally (much like nvm for node.js or jenv for java)

Install pyenv

brew install pyenv

Add this to your ~/.zshrc

export PYENV_ROOT="$HOME/.pyenv"