Category Archives: Software Development

This category contains all my posts about software development. Tutorials, solutions to problems I’ve met, interesting things I’ve stumbled over, code samples, stuff I don’t want to forget, et cetera.

Natural sort in Javascript

Sorting strings naturally/numerically in Javascript is very simple. You just need to remember the existence of the Intl.Collator… which I keep forgetting…

You simply create one and use its compare function:

const collator = new Intl.Collator(undefined, {
    usage: 'sort',
    numeric: true

const simple = ['a1', 'a12', 'a2']
// => ['a1', 'a2', 'a12']

const objects = [{"id": "a1"}, {"id": "a12"}, {"id": "a2"}]
const by = (key) => (a, b) =>[key], b[key])
// => [{id: 'a1'}, {id: 'a2'}, {id: 'a12'}]

Git: Undo last commit

Sometimes I forget to create a new feature branch, and accidentally commit to master. Keep having to look up how to fix it…

# From master, create new branch, which will include the accidental commits
git branch feature/foobar

# Move master HEAD back, which will remove the commits from there
git reset --hard HEAD~1

# Checkout feature branch, where the commits should still exist
git checkout feature/foobar

Heroku deploy sub-directory

Going through a couple of Udemy courses, and figured it was nice to keep all the code I wrote while doing them in a single github repository.

Was working nicely until I started the Node with React where part of the course is to deploy the app to Heroku which wants a full repository pushed to a certain git repo it creates for deployment. But in my case the app I want to deploy is of course a sub-directory…

Turns out there’s a git command called subtree one can use here:

# Setup
heroku login
heroku create

git remote add heroku/some-name{created-heroku-app-id}.git

# Deploy
git subtree push --force --prefix path/to/app heroku/some-name master

The subtree command needs to be run from the top-level directory of the git repository, but one can add a script command to the apps package.json, for example like this:

  "scripts": {
    "deploy": "cd ../../.. && git subtree push --prefix path/to/app heroku/some-name master"

Unfortunately, subtree push doesn’t support --force, but a workaround for that is running it nested like this:

git push heroku/some-name `git subtree split --prefix path/to/app master`:master --force

Which unfortunately doesn’t work on Windows… but you can do it in two steps instead:

git subtree split --prefix path/to/app master
git push heroku/some-name {id-from-previous-command}:master --force