Packages/cond/Coalesce

Node: a ?? b ?? cgithub.com/sahilkhaire/gox/cond

Coalesce

Overview

Coalesce returns the first value that is not the zero value (Node: a ?? b ?? c).

If you are coming from Node.js, the closest pattern is a ?? b ?? c.

Signature

func Coalesce[T comparable](vals ...T) T

Compare: Node.js · Standard Go · gox

Node.js

const name = maybeName ?? 'guest';

Standard Go

name := maybeName
if name == "" {
    name = "guest"
}

gox

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

tests := []struct {
	in	[]int
	want	int
}{
	{[]int{0, 0, 3}, 3},
	{[]int{1, 2}, 1},
	{[]int{}, 0},
}

Example

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

tests := []struct {
	in	[]int
	want	int
}{
	{[]int{0, 0, 3}, 3},
	{[]int{1, 2}, 1},
	{[]int{}, 0},
}

Tips

Prefer explicit zero-value checks in performance-critical hot paths if the compiler cannot prove types.

Standard library alternative

Use the standard library directly:

name := maybeName
if name == "" {
    name = "guest"
}

Related APIs

CoalesceFnCoalescePtrIf

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