Letter frequency: Difference between revisions

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(→‎{{header|jq}}: use an object as a hash)
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=={{header|jq}}==
The following program will report the frequency of all characters in the input file, including newlines, returns, etc, provided the file will fit in memory.<lang jq>
# The input isInput: an array of int;strings.▼
# This function uses an object as a hash table for integers.
# the output isOutput: an object with the imploded valuesstrings as keys,▼
▲# The input is an array of int;
▲# the output is an object with the imploded values as keys,
# the values of which are the corresponding frequencies.
def countcounter:
| reduce .[] as $item ( {}; .[$item] += 1 ) ;▼
map( [.] | implode )
▲ | reduce .[] as $item ( {}; .[$item] += 1 ) ;
 
# For neatness we sort the keys:
explode | count |map( [.] as| $countsimplode | keys) | sort[]counter | [., as $counts[.] ]counter
| keys | sort[] | [., $counter[.] ]
 
</lang>
Example:<lang sh>jq -s -R -c -f Letter_frequency.jq somefile.txt</lang>
Retrieved from "https://rosettacode.org/wiki/Letter_frequency"