The distance formula can be used to find the distance between two points. What if we were trying to walk from point A to point B, but there were buildings in the way? We would need some other formula, but which?

Manhattan Distance
Manhattan distance is the distance between two points in a grid (like the grid-like street geography of the New York borough of Manhattan) calculated by only taking a vertical and/or horizontal path.

Write a function manhattanDistance that accepts two points, pointA and pointB, and returns the Manhattan Distance between the two points.

pointA and pointB are arrays containing the x and y coordinate in the grid. You can think of x as the row in the grid, and y as the column.

Examples:
manhattanDistance( [1, 1], [1, 1] ) // => returns 0
manhattanDistance( [5, 4], [3, 2] ) // => returns 4
manhattanDistance( [1, 1], [0, 3] ) // => returns 3

Tests:
manhattanDistance( [1,2], [1,3] )
manhattanDistance( [5,2], [7,3] )
manhattanDistance( [1,2], [4,4] )

Good luck!

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