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pfertyk's solution

to Two Fer in the Go Track

Published at Jul 13 2018 · 0 comments
Test suite


This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Two-fer or 2-fer is short for two for one. One for you and one for me.

"One for X, one for me."

When X is a name or "you".

If the given name is "Alice", the result should be "One for Alice, one for me." If no name is given, the result should be "One for you, one for me."

Running the tests

To run the tests run the command go test from within the exercise directory.

If the test suite contains benchmarks, you can run these with the --bench and --benchmem flags:

go test -v --bench . --benchmem

Keep in mind that each reviewer will run benchmarks on a different machine, with different specs, so the results from these benchmark tests may vary.

Further information

For more detailed information about the Go track, including how to get help if you're having trouble, please visit the exercism.io Go language page.



Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


package twofer

import "fmt"

// ExampleShareWith() is an Example function. Examples are testable snippets of
// Go code that are used for documenting and verifying the package API.
// They may be present in some exercises to demonstrate the expected use of the
// exercise API and can be run as part of a package's test suite.
// When an Example test is run the data that is written to standard output is
// compared to the data that comes after the "Output: " comment.
// Below the result of ShareWith() is passed to standard output
// using fmt.Println, and this is compared against the expected output.
// If they are equal, the test passes.
func ExampleShareWith() {
	h := ShareWith("")
	// Output: One for you, one for me.


package twofer

import "testing"

// Define a function ShareWith(string) string.

func TestShareWith(t *testing.T) {
	tests := []struct {
		name, expected string
		{"", "One for you, one for me."},
		{"Alice", "One for Alice, one for me."},
		{"Bob", "One for Bob, one for me."},
	for _, test := range tests {
		if observed := ShareWith(test.name); observed != test.expected {
			t.Fatalf("ShareWith(%s) = %v, want %v", test.name, observed, test.expected)
package twofer

import "fmt"

// ShareWith needs a comment documenting it.
func ShareWith(you string) string {
	if you == "" {
		you = "you"
	return fmt.Sprintf("One for %s, one for me.", you)

What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

  • What compromises have been made?
  • Are there new concepts here that you could read more about to improve your understanding?