forked from node-js-libs/node.io
-
Notifications
You must be signed in to change notification settings - Fork 0
/
word_count.coffee
executable file
·49 lines (40 loc) · 1.05 KB
/
word_count.coffee
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
usage = '''
This module uses map/reduce to count word occurrences
1. To count the words from a file
$ node.io word_count < input.txt
'''
nodeio = require 'node.io'
options = {
max: 10
take:10
}
word_count = {}
class WordCount extends nodeio.JobClass
run: (lines) ->
words = []
for line in lines
line = line.toLowerCase().replace(/[^a-z0-9\s]+/g, '').split(' ')
for word in line
words.push word
@emit words
reduce: (words) ->
for word in words
if word_count[word]?
word_count[word]++
else
word_count[word] = 1
return null
complete: ->
output = []
for word, count of word_count
output.push count + ' ' + word
@output output
return true
class UsageDetails extends nodeio.JobClass
input: ->
@status usage
@exit()
@job = {
count: new WordCount(options)
help: new UsageDetails()
}