Matrix

Instructions

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

So given a string with embedded newlines like:

9 8 7
5 3 2
6 6 7

representing this matrix:

    1  2  3
  |---------
1 | 9  8  7
2 | 5  3  2
3 | 6  6  7

your code should be able to spit out:

• A list of the rows, reading each row left-to-right while moving top-to-bottom across the rows,
• A list of the columns, reading each column top-to-bottom while moving from left-to-right.

The rows for our example matrix:

• 9, 8, 7
• 5, 3, 2
• 6, 6, 7

And its columns:

• 9, 5, 6
• 8, 3, 6
• 7, 2, 7

Challenges

• Can you implement this solution without using any for loops? (i.e. using iterators instead)
• Although it would be relatively straight-forward to have two data structures in Matrix (one representing rows and another for columns), can you implement this solution without having to hold two separate copies of the input in your struct?

Helpful Methods

• map()
• filter()
• lines()
• split()
• parse()

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Source

Exercise by the JumpstartLab team for students at The Turing School of Software and Design.