lambda

λ

λ is a functional programming framework for go, which adds support for an alternative error handling workflow using options.

Example usage

Read all lines from stdin

package main

import (
	"fmt"
	λ "github.com/4thel00z/lambda/v1"
	"os"
)

func main() {
	content := λ.Slurp(os.Stdin).UnwrapString()
	// do things with content...
}

Read a file and pipe it to stdout

package main

import (
	λ "github.com/4thel00z/lambda/v1"
	"os"
)

func main() {
	λ.Open("lorem_ipsum.txt").Slurp().WriteString(os.Stdout)
}

Read a JSON file into a struct

package main

import (
	λ "github.com/4thel00z/lambda/v1"
	"strings"
)

type MagicSpell struct {
	Name        string  `json:"name"`
	AttackPower float64 `json:"attack_power"`
	Type        string  `json:"type"`
	Description string  `json:"description"`
}

func main() {
	var (
		m MagicSpell
	)
	λ.Open("magic.json").Slurp().JSON(&m).Catch(λ.Die)
}

Functional conditionals

You never need to check an error with an if clause again. Instead you can define the flow as functional chain, start point is always λ.If. You even can reuse the same chain, it doesn't contain data. You pass the data via Conditional.Do.

package main

import (
	λ "github.com/4thel00z/lambda/v1"
)

func main() {
	manipulateError := λ.Return(λ.Wrap(nil, λ.Error("this error will be thrown")))
	input := λ.Wrap(nil, λ.Error("something is weird"))
	output := λ.If(λ.HasError, manipulateError).Else(λ.Cry).Do(input)
	λ.If(λ.HasNoError, λ.Identity).Else(λ.Cry).Do(output)
}

Make Rest calls

package main

import (
	λ "github.com/4thel00z/lambda/v1"
	"os"
)

func main() {
	λ.Get("https://ransomware.host").Do().Slurp().WriteString(os.Stdout)
}

Todo

• Make Option more flexible an pretty

License

This project is licensed under the GPL-3 license.