Enhanced sort

chapter03/src/process_fork_dir.js

@@ -1,3 +1,4 @@
+/* @flow */
 "use strict";
 
 const fs = require("fs");
@@ -6,7 +7,7 @@ process.on("message", obj => {
     // Received a path to process
     fs
         .readdirSync(obj.path)
-        .sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()))
+        .sort((a, b) => a.localeCompare(b, [], { sensitivity: "base" }))
         .filter(file => !file.startsWith("."))
-        .forEach(file => process.send(file));
+        .forEach(file => process.send && process.send(file));
 });

chapter03/src/process_spawn_dir.js

@@ -9,7 +9,7 @@ process.stdin.on("data", path => {
     // Received a path to process
     fs
         .readdirSync(path)
-        .sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()))
+        .sort((a, b) => a.localeCompare(b, [], { sensitivity: "base" }))
         .filter(file => !file.startsWith("."))
         .forEach(file => process.stdout.write(file + "\n"));