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

that matrix.

So given a string with embedded newlines like:

representing this matrix:

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

Go through the setup instructions for Javascript to

install the necessary dependencies:

Install assignment dependencies:

$ npm install

Execute the tests with:

$ npm test

In the test suites all tests but the first have been skipped.

Once you get a test passing, you can enable the next one by

changing `xtest` to `test`.

Warmup to the `saddle-points` warmup. [http://jumpstartlab.com](http://jumpstartlab.com)

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

export class Matrix {

constructor(str){

this.str = str;

this.rows = this.getRows();

this.columns = this.getColumns();

}

getRows(){

return this.str.split('\n')

.map(element => element

.split(' ')

.map(element => parseInt(element))

);

}

getColumns() {

return this.rows

.map((item, index, array) => array

.map(element => element[index])

);

}

import { Matrix } from './matrix';

describe('Matrix', () => {

test('extract row from one number matrix', () => {

expect(new Matrix('1').rows[0]).toEqual([1]);

});

test('can extract row', () => {

expect(new Matrix('1 2\n3 4').rows[1]).toEqual([3, 4]);

});

test('extract row where numbers have different widths', () => {

expect(new Matrix('1 2\n10 20').rows[1]).toEqual([10, 20]);

});

test('can extract row from non-square matrix', () => {

expect(new Matrix('1 2 3\n4 5 6\n7 8 9\n8 7 6').rows[2]).toEqual([7, 8, 9]);

});

test('extract column from one number matrix', () => {

expect(new Matrix('1').columns[0]).toEqual([1]);

});

test('can extract column', () => {

expect(new Matrix('1 2 3\n4 5 6\n7 8 9').columns[2]).toEqual([3, 6, 9]);

});

test('can extract column from non-square matrix', () => {

expect(new Matrix('1 2 3\n4 5 6\n7 8 9\n8 7 6').columns[2]).toEqual([3, 6, 9, 6]);

});

test('extract column where numbers have different widths', () => {

expect(new Matrix('89 1903 3\n18 3 1\n9 4 800').columns[1]).toEqual([1903, 3, 4]);

});