4

Challenge 4 - Write Your Own cut Tool

This challenge corresponds to the fourth part of the Coding Challenges series by John Crickett https://codingchallenges.fyi/challenges/challenge-cut.

Description

The CUT tool is written in cut.ts file and the index.ts is the command line version of the tool.

Usage

You can use ts-node to run the tool as follows:

# Print out the second field from each line of the file
npx ts-node index.ts -f2 filename

The cut tool supports the following options:

• Single Field index support

  # prints out the first field
  npx ts-node index.ts -f1 filename

• Delimiter support

  # use delimiter "," to separate fields and print out the first field
  npx ts-node index.ts -f1 -d, filename

• Field list support

  # prints out the first and second fields
  npx ts-node index.ts -f1,2

• Standard Input support

  # prints out the first and second fields from the standard input delimited by ","
  cat test.csv | npx ts-node index.ts -d, -f"1 2"

Run tests

To run the tests for the CUT tool, go to the root directory of this repository and run the following command:

npm test src/4/

All the tests are made for LINUX environment only. If you want to run the tests in Windows environment, you can use the Git Bash terminal or Windows Subsystem for Linux (WSL).