Genesis

Generic functions for Go. Bringing the beauty of functional programming in Go 1.18+.

Features:

• Over 130 generic functions for channels, maps, and slices.
• Uses the power of Go 1.18+ generics.
• No code generation.
• No dependencies (except is for testing).
• Pure Go.
• Sync and async versions of all the main functions.
• For slices and channels.

When to use:

• In a big project. More the project grows, more you find yourself writing boring generic code like "Min". Break the cycle.
• In a team project. Each line of code you write means higher maintenance cost that in turn means loosing time and money.
• In a pet project. Leave the boring stuff to us, focus on the fun parts.
• When readability matters. slices.Shrink is a function with a human-friendly name and documentation. s[:len(s):len(s)] is a jibberish and black magic. Prefer the former.
• When you miss some conveniences that come in other languages out-of-the-box.
• When you write a highly concurrent code and don't want to manually implement code for cancellation, results collection and ordering, worker groups, context, etc.

What's inside:

• Filter, Map, and Reduce for data processing on steroids.
• FilterAsync, MapAsync, and ReduceAsync for making your code fast and concurrent with a single line of code.
• Grow and Shrink for reducing memory allocations.
• Permutations and Product for simple iterations.
• Shuffle and Sort for randomization.
• Any and All for simple flow control.
• Range, Count, and Cycle for generating sequences.

And much more.

Installation

go get github.com/life4/genesis

Examples

Find the minimal value in a slice of ints:

lambdas.Must(slices.Min([]int{42, 7, 13})) == 7

Double values in a slice of ints:

slices.Map([]int{4, 8, 15}, func(el int) int { return el * 2 })

Concurrently check status codes for multiple URLs:

urls := []string{
 "https://go.dev/",
 "https://golang.org/",
 "https://google.com/",
}
codes := slices.MapAsync(
 urls, 0,
 func(url string) int {
  return lambdas.Must(http.Get(url)).StatusCode
 },
)

Usage

Genesis contains the following packages:

• slices: generic functions for slices.
• maps: generic functions for maps.
• channels: generic function for channels.
• lambdas: helper generic functions to work with slices.Map and similar.

See DOCUMENTATION for more info.