Node.js solution for week 4, part 2

3 files changed, 50 insertions, 0 deletions

diff --git a/challenge-004/abigail/README.md b/challenge-004/abigail/README.md
index b26977cfc3..382ede17cd 100644
--- a/challenge-004/abigail/README.md
+++ b/challenge-004/abigail/README.md
@@ -49,4 +49,5 @@ The sets of letters are read from standard input.
 * [Bash](bash/ch-2.sh)
 * [C](c/ch-2.c)
 * [Lua](lua/ch-2.lua)
+* [Node.js](node/ch-2.js)
 * [Perl](perl/ch-2.pl)
diff --git a/challenge-004/abigail/node/ch-2.js b/challenge-004/abigail/node/ch-2.js
new file mode 100644
index 0000000000..a239d89949
--- /dev/null
+++ b/challenge-004/abigail/node/ch-2.js
@@ -0,0 +1,46 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-2.js -f filename < input-file
+//
+
+const fs       = require ('fs')
+const readline = require ('readline')
+const yargs    = require ('yargs')
+
+//
+// Parse options using the yargs module
+//
+const argv = yargs . option ('file', {
+                         alias: 'f',
+                         type:  'string',
+                     })
+                   . argv;
+
+let filename = argv . file;
+
+//
+// Extract the words from the file 'filename' which can be
+// made with the letters from 'letters'.
+//
+function find_words (filename, letters) {
+    letters = letters . toLowerCase ()
+                      . split ("")
+    readline . createInterface ({input: fs . createReadStream (filename)})
+             . on ('line', word => {
+                   let copy = word . toLowerCase ()
+                   letters . forEach (l => {
+                       copy = copy . replace (l, "")
+                   })
+                   if (copy == "") {
+                       console . log (word)
+                   }
+             })
+}
+
+readline . createInterface ({input: process . stdin})   
+         . on ('line', letters => find_words (filename, letters))
diff --git a/challenge-004/abigail/t/ctest.ini b/challenge-004/abigail/t/ctest.ini
index 6675a345b1..161f1c35f0 100644
--- a/challenge-004/abigail/t/ctest.ini
+++ b/challenge-004/abigail/t/ctest.ini
@@ -6,6 +6,9 @@
 [challenges/1]

 extra_tests = Check_Program_Size

 

+[2-1/node]

+line_at_a_time = 1

+

 [2-1]

 args = -f t/words.txt