Walter Schulze awalterschulze

Generic functions cannot be passed as values

While developing GoDerive, a code generator for Go, I ran into the following problem.

I could not infer the type of the input arguments of a function, if that function's input argument types are not specified and the function is not being called right away.

I wanted to write:

func TestCurriedEqualCompileError(t *testing.T) {

For Sum Types: Multiple return parameters are overrated

In this Go Experience Report I am going to make a case for sum types over multiple return parameters.

Analysis of multiple return parameters

I wrote a little tool which does some analysis of Go source code:

https://github.com/awalterschulze/goanalysis

	package "main"

	import "somelibrary"
	import "flags"

	func main() {
	someFlag := somelibrary.Impls.Flag()
	flags.Parse()
	someImpl := somelibrary.GetImpl(someFlag)
	run(someImpl)

	var start = Date.now();
	$.ajax({
	method: 'GET',
	url: 'someurl'
	})
	.done(function () {
	$someElement.html('<div id="results"></div>');
	console.log("done", Date.now() - start);
	})
	.fail(function () {

	all:
	make build
	make objdump

	build:
	go build -gcflags -m main.go

	objdump:
	go tool objdump -s "main.main" main \| grep CALL

	DOCKER_COMPOSE := $(shell command -v docker-compose 2>/dev/null)
	ifndef DOCKER_COMPOSE
	DOCKER_COMPOSE = docker run --rm -i --volume /var/run/docker.sock:/var/run/docker.sock --volume $(shell pwd):/composefile -w /composefile docker/compose:1.8.1
	endif

	FROM cassandra:3.1.1

	RUN mkdir -p /tmp/var/lib/cassandra /etc/cassandra \
	&& chown -R cassandra:cassandra /tmp/var/lib/cassandra /etc/cassandra \
	&& chmod 777 /tmp/var/lib/cassandra /etc/cassandra

	RUN sed -i "s~/var/lib/cassandra~/tmp/var/lib/cassandra~g" /etc/cassandra/cassandra.yaml

	COPY *.cql /tmp/

	GODOCKER = docker run --network host --rm --user $(shell id -u):$(shell id -g) -v $(PWD):/go/src/path/to/project -w /go/src/path/to/project golang:1.8.3-alpine3.6
	GOFLAGS = -ldflags '-d' -tags netgo -installsuffix netgo

	build:
	$(GODOCKER) go build $(GOFLAGS) -o ./cmd/mycmd/mycmd ./cmd/mycmd

	test:
	$(GODOCKER) go test -test.v ./...