update

Task/Semordnilap/JavaScript/semordnilap-1.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+var  fs = require('fs');
+var sys = require('sys');
+
+var dictFile = process.argv[2] || "unixdict.txt";
+
+var dict = {};
+fs.readFileSync(dictFile)
+  .toString()
+  .split('\n')
+  .forEach(function(word) {
+    dict[word] = word.split("").reverse().join("");
+  });
+
+function isSemordnilap(word) { return dict[dict[word]]; };
+
+var semordnilaps = []
+for (var key in dict) {
+  if (isSemordnilap(key)) {
+    var rev = dict[key];
+    if (key < rev) {
+      semordnilaps.push([key,rev]) ;
+    }
+  }
+}
+
+var count = semordnilaps.length;
+sys.puts("There are " + count + " semordnilaps in " +
+         dictFile + ".  Here are 5:" );
+
+var indices=[]
+for (var i=0; i<count; ++i) {
+  if (Math.random() < 1/Math.ceil(i/5.0)) {
+    indices[i%5] = i
+  }
+}
+indices.sort()
+for (var i=0; i<5; ++i) {
+  sys.puts(semordnilaps[indices[i]]);
+}

Task/Semordnilap/JavaScript/semordnilap-2.js

@@ -0,0 +1,38 @@
+#!/usr/bin/env rhino
+
+importPackage (java.io)
+
+var dictFile = arguments[0] || "unixdict.txt";
+
+var reader = new BufferedReader(new FileReader(dictFile));
+var dict = {};
+var word;
+while (word = reader.readLine()) {
+  dict[word] = word.split("").reverse().join("");
+}
+
+function isSemordnilap(word) { return dict[dict[word]]; };
+
+var semordnilaps = []
+for (var key in dict) {
+  if (isSemordnilap(key)) {
+    var rev = dict[key];
+    if (key < rev) {
+      semordnilaps.push([key,rev]) ;
+    }
+  }
+}
+
+var count = semordnilaps.length;
+print("There are " + count + " semordnilaps in " +
+      dictFile + ".  Here are 5:" );
+var indices=[]
+for (var i=0; i<count; ++i) {
+  if (Math.random() < 1/Math.ceil(i/5.0)) {
+     indices[i%5] = i
+  }
+}
+indices.sort()
+for (var i=0; i<5; ++i) {
+  print(semordnilaps[indices[i]]);
+}