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context-fp-go\n\n![logo](logo.png)\n\nFunctional programming context for Golang \u003cbr/\u003e\n\n## Motivation\n\nif you want Dependency injection for Golang using plain functions, you are in the right place.\n\n## Features\n\n- 🤏 Tiny size and most of it is Golang generics\n- 💉 Dependency injection without magic, only functions\n- 🤌 Functions cached during workflow, no excess cost of CPU\n- 💡 Smart type inference, only think about Context type and rest will be checked\n- ♻️ Unit tests friendly, feel free to pass mocked function in the Context\n- 📦 Tiny Redux like state manager also attached\n\n## How to\n\n#### Basic example\n\n```golang\nimport (\n  \"github.com/samber/lo\"\n  \"github.com/darky/context-fp-go\"\n)\n\ntype Context struct {\n  numbers []int\n}\npositiveNumbers := func(ctx *Context) []int {\n  return lo.Filter(ctx.numbers, func(n int, i int) bool { return n \u003e 0 })\n}\nnumbersPrefix := func(ctx *Context) string {\n  return \"Here is numbers:\"\n}\npositiveNumbersAsString := Cfp2(\n  \u0026positiveNumbers,\n  \u0026numbersPrefix,\n  func(ns []int, prefix string) string {\n    ns2str := lo.Map(ns, func(n int, i int) string { return fmt.Sprintf(\"%v\", n) })\n    return prefix + \" \" + strings.Join(ns2str, \",\")\n  },\n)\nassert.Equal(t,\n  positiveNumbersAsString(\u0026Context{\n    numbers: []int{-1, -5, 7, 0, 4},\n  }),\n  \"Here is numbers: 7,4\",\n)\n```\n\n#### Calculations cached example\n\n```golang\nimport (\n  \"github.com/samber/lo\"\n  \"github.com/darky/context-fp-go\"\n)\n\ntype Context struct {\n  numbers []int\n}\ncalled := 0\npositiveNumbers := func(ctx *Context) []int {\n  called++\n  return lo.Filter(ctx.numbers, func(n int, i int) bool { return n \u003e 0 })\n}\npositiveNumbersLength := Cfp1(\n  \u0026positiveNumbers,\n  func(ns []int) int {\n    return len(ns)\n  },\n)\npositiveNumbersAsString := Cfp2(\n  \u0026positiveNumbers,\n  \u0026positiveNumbersLength,\n  func(ns []int, length int) string {\n    ns2str := lo.Map(ns, func(n int, i int) string { return fmt.Sprintf(\"%v\", n) })\n    return strings.Join(ns2str, \",\") + \"; length - \" + fmt.Sprintf(\"%v\", length)\n  },\n)\nassert.Equal(t,\n  positiveNumbersAsString(\u0026Context{\n    numbers: []int{-1, -5, 7, 0, 4},\n  }),\n  \"7,4; length - 2\",\n)\nassert.Equal(t, called, 1)\n```\n\n#### Dependency injection example\n\n```golang\nimport (\n  \"github.com/darky/context-fp-go\"\n)\n\ntype User struct {\n  name string\n}\ntype Context struct {\n  fetchUser func() User\n}\nfetchUserFromDB := func() User {\n  // some production implementation\n}\nfetchUser := func(ctx *Context) User {\n  if ctx.fetchUser == nil {\n    return fetchUserFromDB()\n  }\n  return ctx.fetchUser()\n}\nhelloWorldUser := Cfp1(\u0026fetchUser, func(user User) string {\n  return \"Hello world, \" + user.name\n})\nassert.Equal(\n  t,\n  helloWorldUser(\u0026Context{fetchUser: func() User { return User{name: \"Vasya\"} }}),\n  \"Hello world, Vasya\",\n)\n```\n\n#### State manager example\n\n```golang\nimport (\n  \"github.com/darky/context-fp-go\"\n)\n\ntype N struct {\n  n int\n}\ntype Context struct {\n  incNumber int\n}\nnumbers := func(ctx *Context) func(payload *N) []int {\n  return Sfp(\n    func(ns []int, payload *N) []int {\n      return append(ns, payload.n+ctx.incNumber)\n    },\n    []int{},\n  )\n}\naddNumber1 := Cfp1(\u0026numbers, func(ns func(payload *N) []int) []int {\n  return ns(\u0026N{1})\n})\naddNumber2 := Cfp1(\u0026numbers, func(ns func(payload *N) []int) []int {\n  return ns(\u0026N{2})\n})\naddNumber3 := Cfp1(\u0026numbers, func(ns func(payload *N) []int) []int {\n  return ns(\u0026N{3})\n})\nnumbersToString := Cfp4(\n  \u0026numbers,\n  \u0026addNumber1,\n  \u0026addNumber2,\n  \u0026addNumber3,\n  func(ns func(payload *N) []int, n1 []int, n2 []int, n3 []int) string {\n    return strings.Join(\n      lo.Map(ns(nil), func(n int, i int) string { return fmt.Sprintf(\"%v\", n) }),\n      \",\",\n    )\n  },\n)\nassert.Equal(t,\n  numbersToString(\u0026Context{incNumber: 1}),\n  \"2,3,4\",\n)\n```\n\n## See also\n\n- [context-fp](https://github.com/darky/context-fp) - Functional programming context for TypeScript\n- [functx](https://github.com/darky/functx) - Functional programming context for Gleam\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdarky%2Fcontext-fp-go","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdarky%2Fcontext-fp-go","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdarky%2Fcontext-fp-go/lists"}