Summary of Articles on Using Frequency Hash

Joaquín Menchaca (智裕)

May 17, 2019·2 min read

I wrote a few articles on using a frequency hash in various languages to show some features of the languages that are useful in operations scripting and automation chores. These articles may be useful as a way to compare and contrast the languages and approaches.

Python

The Problem

The Solution with Iteration

Demonstrates procedural way with for…in open() loop construct.

The Solution in Serial Functional Way

Demonstrates how to build a dictionary with filter() and map() methods and introduces regex.

Ruby

The Problem

The Solution with Iteration

This demonstrates using procedural methods with File.open {} construct.

The Solution in Serial Functional Way

This shows how to use select {} and map {} methods to build the hash and introduces regex.

Perl

This article has both the problem and solutions using procedural while loop and more serial approach with functional programming style using grep {} and map {}.

Shell (BASH)

The Problem

The Solution in a Procedural Way

This shows how to use either while read or for to process files and ways to split text with Bash.

The Solution in Pipeline with Subshell

This article shows how to use either internal split mechanism or external tools like cut, sed, awk, grep, and perl to split and filter text.