Teamwork-go

A code assessment submission for Teamwork. Details of the backend code challenge below:

package customerimporter reads from the given customers.csv file and returns a sorted (data structure of your choice) of email domains along with the number of customers with e-mail addresses for each domain. Any errors should be logged (or handled). Performance matters (this is only ~3k lines, but could be 1m lines or run on a small machine).

Installation & Instructions for use

Clone the project:

git clone [email protected]:CathalG/teamwork-go.git

Run the project: Assuming Go is installed on your machine:

go run interview.go

Expected Output: The main function of the application will output the results of the CSV customer import to the command line in the format shown below:

Domain: php.net => Users: 2
Domain: census.gov => Users: 7 
Domain: digg.com => Users: 2   
Domain: meetup.com => Users: 4

Testing

Unit and performance tests can be found in:

interview_test.go

Running Tests: I've included a table-driven test to validate several expected outputs, these can be found/modified in 'countTests'. To run:

go test

There's also a benchmark test to evaluate the performance of customerimporter:

go test -bench=.

Sample benchmark output:

$ go test -bench=.
goos: windows
goarch: amd64
pkg: teamwork-go-tests
cpu: Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
BenchmarkCustomerImporter-8          470           2399312 ns/op
PASS
ok      teamwork-go-tests       1.577s