Dan Hodge danhodge

Tips & Tricks

	// types and literals

	// defines a new type (note - this is not a type alias, type aliases are a different thing)
	type Thing int32

	// this function only accepts arguments of type Thing, int32 arguments are not allowed by the compiler
	func justThings(t Thing) {
	// do stuff
	}

	# filter tests by name (works for standalone test functions or method names on a test class)
	#
	# pytest <test_file.py> -k test_foo
	# pytest <test_file.py> -k 'test_foo or test_bar'

	# run the same test multiple times with different parameters

	@pytest.mark.parametrize("p1, p2", [(1, 2), (3, 4), (5,6)])
	def test_foo(p1, p2):
	assert bar(p1) == p2

	# debugging
	import pdb
	pdb.set_trace()

	# override a class method in a subclass (Python 2.x)
	class Foo(object):
	@classmethod
	def baz(cls, x):
	return x + 3

	Creating an Animated Gif Screen Recording
	1. CMD+SHIFT+5 -> choose "Record Selected Portion"
	2. Position box of region of screen being recorded
	3. Hit Record
	4. CMD+SHIFT+5 -> hit "Stop" button
	4. Use Gifski application to convert movie file into animated gif

	Find out which process is listening on <PORT>
	sudo lsof -nP -i4TCP:<PORT> \| grep LISTEN

	# Excon exposes defaults for injecting configuration parameters
	Excon.defaults[:mock] = true
	Excon.defaults.delete(:mock)

	# Excon stubbing
	# first parameter - Hash of expected request attributes (all are optional)
	# second parameter - Hash of response attributes
	# if second parameter is omitted, a block can be provided a Proc object
	Excon.stub({ method: :post, path: exp_path, headers: exp_headers, query: exp_query, body: exp_body }, { status: 200 })

	To _not_ transitively update the dependencies of a gem when doing a bundle update, use --conservative
	% bundle update --conservative <gem>

	Install gems to a different path
	bundle install --path .

	Override a deployment packaged bundle (i.e. add new gems to a bundle already packaged for deployment)
	bundle install --no-deployment

	Install
	% npm install -g typescript

	Start a new node.js project
	% npm init
	% npm install typescript -s

	Add "tsc" script to package.json
	"scripts": {
	"tsc": "tsc"

	# just show the IP address
	% dig <DNS_NAME> +short