Exercise: parse a line and calculate its value

A line is a string of arbitrary length that also includes words incr and decr. The value is calculated as +1 for each occurrence of incr and -1 for decr.

Example:

sdlkfjincrsadldecrklejinincrsdčlgkincr = 2
      ----    ----      ----      ----

dslfkjdedecrxx = -1
        ----

Expected result

A program that will use 3 sources of "lines", parse each line and calculate its value and print the results:

• the number of all lines (should be 1000) and sum of all values
• also, print number of lines and sum only for lines with positive values and one for lines with negative values

To do the above you're expecred to write:

• a parser that reads a line and calculates the value
• for each source of data, get 1000 lines, evaluate each and print number of lines and sum;

Data Sources

You have 3 sources of data that generate strings, line by line

1. linegenerator, a crate you can use to generate a random line
2. A file 1000lines.txt
3. An HTTP server lineserver you can run as a binary an retrieve the data from it

End notes

Doing this in 45 minutes is hard (you're not even expected to finish every detail), but keep in mind that it's important to demonstrate your approach, including:

• ability to set up a development environment, run programs and use crates
• basic knowledge of string manipulation
• writing unit tests
• design for reusability of code
• have some general grasp how to do file and networking IO