Initial commit of modash

This was taken from github.com/lmika/gopkgs/fp

moslice/foreach.go

@@ -0,0 +1,13 @@
+package moslice
+
+// ForEachWithError runs the passed in function for each element of T. If an error
+// is encountered, the error is returned immediately and any subsequence elements
+// will not be processed.
+func ForEachWithError[T any](ts []T, fn func(t T) error) error {
+	for _, t := range ts {
+		if err := fn(t); err != nil {
+			return err
+		}
+	}
+	return nil
+}