Packages/cond/IfLazy

Node: cond ? f() : g()github.com/sahilkhaire/gox/cond

IfLazy

Overview

IfLazy evaluates a or b lazily via thunks (Node: cond ? a() : b()).

If you are coming from Node.js, the closest pattern is cond ? f() : g().

Signature

func IfLazy[T any](cond bool, a, b func() T) T

Compare: Node.js · Standard Go · gox

Node.js

const v = cond ? expensive() : fallback();

Standard Go

var v T
if cond {
    v = expensive()
} else {
    v = fallback()
}

gox

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

called := 0
got := IfLazy(false, func() int { called++; return 1 }, func() int { return 2 })
got = IfLazy(true, func() int { return 3 }, func() int { called++; return 4 })

Example

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

called := 0
got := IfLazy(false, func() int { called++; return 1 }, func() int { return 2 })
got = IfLazy(true, func() int { return 3 }, func() int { called++; return 4 })

Tips

Import github.com/sahilkhaire/gox/cond and call IfLazy directly. See the comparison below for the standard library equivalent.

Standard library alternative

Use the standard library directly:

var v T
if cond {
    v = expensive()
} else {
    v = fallback()
}

Related APIs

CoalesceCoalesceFnCoalescePtr

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