lof

package

v0.28.0 Latest Latest Go to latest Published: Mar 3, 2026 License: MIT Imports: 2 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.

This section is empty.

This section is empty.

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 IsNotBlank(s string) bool

IsNotBlank returns true if s contains non-whitespace characters.

func IsNotEmpty(s string) bool

IsNotEmpty returns true if s is non-empty.

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.

This section is empty.