Packages/slice/Map

Node: arr.map(fn)github.com/sahilkhaire/gox/slice

Map

Overview

Transforms each element of a slice, returning a new slice — identical mental model to Array.prototype.map. Uses Go generics so input and output types can differ safely.

If you are coming from Node.js, the closest pattern is arr.map(fn).

Signature

func Map[T, U any](in []T, fn func(T) U) []U

Compare: Node.js · Standard Go · gox

Node.js

const names = users.map(u => u.name);

Standard Go

names := make([]string, len(users))
for i, u := range users {
    names[i] = u.Name
}

gox

import "github.com/sahilkhaire/gox/slice"

names := slice.Map(users, func(u User) string { return u.Name })

Example

import "github.com/sahilkhaire/gox/slice"

names := slice.Map(users, func(u User) string { return u.Name })

Tips

Chain with slice.Filter and slice.Reduce for lodash-style pipelines. Pre-allocates output slice for performance.

Standard library alternative

Use the standard library directly:

names := make([]string, len(users))
for i, u := range users {
    names[i] = u.Name
}

Related APIs

ChunkContainsEvery

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