add day 6 of 100 days of code

blog/2023-08-19-day-6-100-days-of-code.md

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+---
+slug: day-6-100-days-of-code
+title: Day 6 of 100 Days of Code
+description: A slow day, but I do some things
+image: https://github.com/rickmff/100DiasDeCodigo-landing/blob/master/public/thumb.png
+authors: paulohfs
+tags: [100DaysOfCode, go, English, Concurrent Programming, Process, Thread, Routine, Concurrency, Parallelism]
+---
+
+Today was a slow day for me, I can't concentrate to study, but I do some things.
+
+- Study about Concurrency and Parallelism in general. I see the diferences an learning that they are concepts that are related, but not the same thing. I write a [node](https://www.paulohernane.me/my-brain/concurrent-programming/concurrency-vs-parallelism) about it.
+- I study Golang, start to build a Rest API using a tutorial, but I don't finish it because I fell that I need to learn more about the syntax and the language itself. So I build a validate CPF function with some unit tests, and I learn about the `go test` command. The validate CPF is a nice function to implement in a new language because its need a lot of things like: string manipulation, loops, type conversion, and more. So it is nice to now what you need to now about a new language!
+
+Want to know about the 100 Days of Code Challenge? Check it out [here](https://www.100daysofcode.com/). [PT-BR](<https://www.100diasdecodigo.dev/>)