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Grep in Go

Exercise: Solve this exercise in Go with test cases.

Labels: Intermediate

Time to complete: 4-5 days

What will you learn:

Basics of CLI building in Go, parsing CLI flags, cobra library

File reading and writing, dealing with a large number of files

Writing table-driven tests

Power of interfaces in Go (io.Reader interface)

Using channels and goroutines to efficiently process multiple files in parallel, mutex, fan-in pattern for goroutines and channels.

How to evaluate your solution:

Grep code feedback

Actual Solution:

Don’t look at the solution unless you have you. Otherwise, you’re not getting much value from the bootcamp.

I know what I am doing; stop patronizing me.

If you say so 🤷, here’s the sample implementation - https://github.com/ishan-p/go-grep

Resources:

▶️ Building Grep using Test driven development in Go on One2N YouTube channel (it’s a long playlist, watch at 2x speed). This playlist contains a live code walkthrough where we build Grep in Go using Test Driven Development. https://www.youtube.com/playlist?list=PLMrAF6rR54XoimthOUqXkPXlIAVuE4N0i. If you find the videos too long and prefer a text version summary, see below:

Grep YouTube Playlist notes

How to unit test code that reads from STDIN https://stackoverflow.com/questions/46365221/fill-os-stdin-for-function-that-reads-from-it

Writing command line applications in Go https://learning.oreilly.com/library/view/practical-go/9781119773818/c01.xhtml read Chapter 1 from this Practical Go book.