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rootulp's solution

to Two Fer in the Go Track

Published at Jun 01 2020 · 0 comments
Instructions
Test suite
Solution

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

Given a name, return a string with the message:

One for X, one for me.

Where X is the given name.

However, if the name is missing, return the string:

One for you, one for me.

Here are some examples:

Name String to return
Alice One for Alice, one for me.
Bob One for Bob, one for me.
One for you, one for me.
Zaphod One for Zaphod, one for me.

Coding the solution

Look for a stub file having the name two_fer.go and place your solution code in that file.

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.

Source

https://github.com/exercism/problem-specifications/issues/757

Submitting Incomplete Solutions

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

example_two_fer_test.go

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("")
	fmt.Println(h)
	// Output: One for you, one for me.
}

two_fer_test.go

package twofer

import "testing"

// Define a function ShareWith(string) string.

var 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."},
}

func TestShareWith(t *testing.T) {
	for _, test := range tests {
		if observed := ShareWith(test.name); observed != test.expected {
			t.Fatalf("ShareWith(%s) = \"%v\", want \"%v\"", test.name, observed, test.expected)
		}
	}
}

func BenchmarkShareWith(b *testing.B) {
	for i := 0; i < b.N; i++ {

		for _, test := range tests {
			ShareWith(test.name)
		}

	}
}
package twofer

import "fmt"

// ShareWith returns a string in the following format: "One for you, one for me."
// if a name is provided, it is used instead of "you".
func ShareWith(name string) string {
	if name == "" {
		name = "you"
	}
	return fmt.Sprintf("One for %s, one for me.", name)
}

Community comments

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What can you learn from this solution?

A huge amount can be learned from reading other peopleโ€™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?