lof

package

v0.27.0 Latest Latest Go to latest Published: Mar 1, 2026 License: MIT Imports: 1 Imported by: 0

Details

Go builtins wrapped as passable functions for collection chains.

len and fmt.Println are operators, not functions — you can't pass them to higher-order methods. lof bridges the gap.

names.Each(lof.Println)

// Length of each inner slice — reports is [][]Page
pageCounts := slice.From(reports).ToInt(lof.Len)

// String lengths
charCounts := names.ToInt(lof.StringLen)

See pkg.go.dev for complete API documentation, the main README for installation, and slice for the collection methods that consume these wrappers.

Package lof provides utility functions for functional programming.

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func IfNotEmpty(s string) (string, bool)

IfNotEmpty returns s and whether s is non-empty. Converts "empty string = absent" returns to Go's comma-ok idiom.

result := cmp.Diff(want, got)
if diff, ok := lof.IfNotEmpty(result); ok {
    t.Errorf("mismatch:\n%s", diff)
}

func Len[T any](ts []T) int

Len wraps the len builtin for slices.

func Println(s string)

Println wraps fmt.Println for strings.

func StringLen(s string) int

StringLen wraps the len builtin for strings.

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