Book: Mojo By Example is now updated with changes corresponding to Mojo 1.0.b2

General
1

Hi all,

New update has been released for the book Mojo By Example. You can find the latest at: Mojo By Example: A Comprehensive Introduction to the Mojo Programming Language

I have updated the book with the new language changes up to 1.0.b2.

The change log is available in: https://ruhati.net/mojo/\_revision_history.html

Regards

2

Great work on this! These visuals are handy

Function_Structure_Def
Function_Structure_Def1920Ă—1080 329 KB

3

Hey! Nice project - I noticed a minor issue in your constants and variables section

The main benefit of a constant is that the compiler prevents any attempt to change the initially assigned value during the program execution.



def main():
    comptime counter: Int = 1
    print(counter)
    counter = counter + 3
    print(counter)

The explanation doesn’t feel quite right as the following compiles and runs without issue:

comptime counter: Int = 1


def main():
    # compiler prevents modification of compile time constants... or does it?
    print(counter)
    counter = counter + 3
    print(counter)

(mojo-by-example) âžś mojo 03_constants_variables.mojo
1
4

Inside the function counter is implicitly declared as a new local variable shadowing the global constant… tricky!

4

Thanks for the feedback!!

Yes, the shadowing is a bit tricky. I also realized that I didn’t provide information on shadowing in the book. I will include it in the next version. Thanks for the catch!

6

In Mojo, there are two ways to define a function. The first way is inspired by Rust and the second by Python. Both styles are equally first class in Mojo and both have their own use cases.

I think this section of the functions intro is a holdover from before fn was deprecated.

7

Oops! Thanks for the catch! I missed fixing that one :face_with_peeking_eye: