Add Longest Word in Dart (#4978)

Author: gangaasoonu

archive/d/dart/longest-word.dart

@@ -0,0 +1,21 @@
+//Issue 4972
+
+void main(List<String> argv){
+  const String error_message = "Usage: please provide a string";
+  if (argv.isEmpty || argv[0].isEmpty){
+    print(error_message);
+    return;
+  }
+
+  String sentence = argv[0];
+  String raw = sentence.replaceAll(r'\t', '\t').replaceAll(r'\r', '\r').replaceAll(r'\n', '\n');
+  List<String> words = raw.split(RegExp(r'\s+'));
+  int max_length= 0;
+
+  for (String each_word in words){
+    if (each_word.length > max_length){
+      max_length = each_word.length;
+    }
+  }
+  print(max_length);
+}