pskevin commented on a change in pull request #12445:
URL: https://github.com/apache/beam/pull/12445#discussion_r465365506
##########
File path: sdks/go/examples/xlang/wordcount/xlang_wordcount.go
##########
@@ -0,0 +1,100 @@
+package main
+
+import (
+ "context"
+ "flag"
+ "fmt"
+ "log"
+ "regexp"
+ "strings"
+
+ "github.com/apache/beam/sdks/go/pkg/beam/core/typex"
+ "github.com/apache/beam/sdks/go/pkg/beam/core/util/reflectx"
+
+ "github.com/apache/beam/sdks/go/pkg/beam"
+ "github.com/apache/beam/sdks/go/pkg/beam/io/textio"
+ "github.com/apache/beam/sdks/go/pkg/beam/x/beamx"
+
+ // Imports to enable correct filesystem access and runner setup in
LOOPBACK mode
+ _ "github.com/apache/beam/sdks/go/pkg/beam/io/filesystem/gcs"
+ _ "github.com/apache/beam/sdks/go/pkg/beam/io/filesystem/local"
+ _ "github.com/apache/beam/sdks/go/pkg/beam/runners/universal"
+)
+
+var (
+ // Set this option to choose a different input file or glob.
+ input = flag.String("input", "./input", "File(s) to read.")
+
+ // Set this required option to specify where to write the output.
+ output = flag.String("output", "./output", "Output file (required).")
+)
+
+var (
+ wordRE = regexp.MustCompile(`[a-zA-Z]+('[a-z])?`)
+ empty = beam.NewCounter("extract", "emptyLines")
+ lineLen = beam.NewDistribution("extract", "lineLenDistro")
+)
+
+// extractFn is a DoFn that emits the words in a given line.
+func extractFn(ctx context.Context, line string, emit func(string)) {
+ lineLen.Update(ctx, int64(len(line)))
+ if len(strings.TrimSpace(line)) == 0 {
+ empty.Inc(ctx, 1)
+ }
+ for _, word := range wordRE.FindAllString(line, -1) {
+ emit(word)
+ }
+}
+
+// formatFn is a DoFn that formats a word and its count as a string.
+func formatFn(w string, c int64) string {
+ fmt.Println(w, c)
Review comment:
Thanks for catching that! Ack.
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