A library providing useful functional programming helpers for Go 1.18

Related tags

Learning Tutorial go golang library functional-programming go118
Overview

Underscore

License Go version

underscore

underscore is a Go library providing useful functional programming helpers without extending any built-in objects.

It is mostly a port from the underscore.js library based on generics brought by go1.18.

Usage

Please check out the examples to see how to use the library.

package main

import (
	"fmt"
	u "github.com/rjNemo/underscore"
)

func main() {
	numbers := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
	// filter even numbers from the slice
	isEven := func(n int) bool { return n%2 == 0 }
	evens := u.Filter(numbers, isEven)
	// square every number in the slice
	toSquare := func(n int) int { return n * n }
	squares := u.Map(evens, toSquare)
	// reduce to the sum 
	sum := func(n, acc int) int { return n + acc }
	res := u.Reduce(squares, sum, 0)

	fmt.Println(res) // 110
}

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

You need at least go1.18 for development. The project is shipped with a Dockerfile based on go1.18. If you prefer local development, at the moment the easiest way to do it:

go install golang.org/dl/[email protected]
go1.18beta1 download

Installing

First clone the repository

git clone https://github.com/rjNemo/underscore.git

Install dependencies

go mod download

And that's it.

Tests

Building the docker image will run the tests automatically. Otherwise, you can simply run:

go test ./...

Functions

underscore provides 100s of functions that support your favorite functional helpers

Collections

  • map
  • filter
  • reduce
  • each
  • some
  • every
  • find
  • contains (only numerics values at the moment)
  • max
  • min
  • partition

Built With

  • Go - Build fast, reliable, and efficient software at scale

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

Authors

  • Ruidy - Initial work - Ruidy

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgments

This project is largely inspired by Underscore.js library. Check out the original project if you don't already know it.

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Comments
  • Adding some new funky functions

    Adding some new funky functions

    Created the Join, JoinProjection, Range, SumMap, Zip functions, each function is documented with how it works and has a unit test or maybe more

    Created a Tuple struct as some of the new functions require you to return a new slice with two fields which is the result of the new functions, i.e. Join and Zip

    enhancement 
    opened by theouteredge 2
  • Contains should require comparable, not constraints.Ordered

    Contains should require comparable, not constraints.Ordered

    As stated in the title, Contains should require the type to be comparable and not constraints.Ordered, as it add useless type limitation.

    For example this function is not usable with string.

    enhancement 
    opened by Ludonope 1
  • [FEATURE] Each with multiple args

    [FEATURE] Each with multiple args

    would you accept tests helpers on this repo ?

    like parametrize ?

    func parametrize[V any, T any](fn T, allValues [][]V) {
    v := reflect.ValueOf(fn)
    for _, a := range allValues {
        vargs := make([]reflect.Value, len(a))

        for i, b := range a {
            vargs[i] = reflect.ValueOf(b)
        }
        v.Call(vargs)
    }
}

func tutu(a int) int {
    return a + 1
}

func Test_tutu(t *testing.T) {
    testsArgs := [][]any{
        {t, 1, 2}, {t, 3, 4},
    }
    test := func(t *testing.T, input int, expected int) {
        assert.Equal(t, tutu(input), expected)
    }
    parametrize(test, testsArgs)
}
    enhancement 
    opened by raphaelauv 2
Releases(v0.5.0)

  • v0.5.0(Sep 4, 2022)

    What's Changed

    • add flatmap by @rjNemo in https://github.com/rjNemo/underscore/pull/31
    • Adding some new funky functions by @theouteredge in https://github.com/rjNemo/underscore/pull/32

    New Contributors

    • @theouteredge made their first contribution in https://github.com/rjNemo/underscore/pull/32

    Full Changelog: https://github.com/rjNemo/underscore/compare/v0.4.0...v0.5.0

    Source code(tar.gz)
    Source code(zip)

  • v0.4.0(Mar 23, 2022)

    What's Changed

    • add unit test pipeline by @rjNemo in https://github.com/rjNemo/underscore/pull/8
    • feat: maps map by @rjNemo in https://github.com/rjNemo/underscore/pull/9
    • each by @rjNemo in https://github.com/rjNemo/underscore/pull/10
    • use comparable constraint in contains by @rjNemo in https://github.com/rjNemo/underscore/pull/12
    • :sparkles: sum by @rjNemo in https://github.com/rjNemo/underscore/pull/13
    • clean build files by @rjNemo in https://github.com/rjNemo/underscore/pull/14
    • Code coverage by @rjNemo in https://github.com/rjNemo/underscore/pull/15
    • Add Result type by @rjNemo in https://github.com/rjNemo/underscore/pull/16
    • last function by @rjNemo in https://github.com/rjNemo/underscore/pull/17
    • drop by @rjNemo in https://github.com/rjNemo/underscore/pull/18
    • docsite by @rjNemo in https://github.com/rjNemo/underscore/pull/19

    Full Changelog: https://github.com/rjNemo/underscore/compare/v0.3.0...0.4.0

    Source code(tar.gz)
    Source code(zip)

  • v0.3.0(Jan 1, 2022)

  • v0.2.0(Dec 31, 2021)

  • v0.1.0(Dec 30, 2021)

Owner
Ruidy
Senior Full Stack Engineer
Ruidy
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