function extractMatrixColumn(matrix, column) {
    return matrix.map((innerArray) => innerArray[column] )
}



/**
* Test Suite 
*/
describe('extractMatrixColumn()', () => {
    it('returns the element from nested arrays at column (index)', () => {
        // arrange
        const matrix = [[1, 1, 1, 2], [0, 5, 0, 4], [2, 1, 3, 6]];
        const column = 2;
        
        // act
        const result = extractMatrixColumn(matrix, column);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual([1, 0, 3]);
    });
    it('returns the element from nested arrays at column (index)', () => {
        // arrange
        const matrix = [[1, 2, 3, 4], [5, 6, 7], [8, 9, 10, 11, 12]];
        const column = 2;
        
        // act
        const result = extractMatrixColumn(matrix, column);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual([3, 7, 10]);
    });    
});