FP baby steps: detect if two Chess Queens can attack each other

QueenAttack.js

// QueenAttack.js

var QueenAttack = ( function(){

	function sameRow( board ){
		return board.white.x === board.black.x;
	}

	function sameColumn( board ){
		return board.white.y === board.black.y;
	}

	function sameDiagonal( board ){
		return Math.abs( board.white.x - board.black.x ) === Math.abs( board.white.y - board.black.y ); // wrong ?
	}

	// Can attack each other?
	function canAttack( board ){
		return sameRow( board ) || sameColumn( board ) || sameDiagonal( board );
	}

	function init( config ) {
		return {
			white: config.white,
			black: config.black
		};
	}

	return {
		init: init,
		canAttack: canAttack
	};

} )();

// Test

function run(){
	var white = { x: 0, y: 1 },
	  black = { x: 1, y: 0 },
	  config,
	  board;

	config = { white: white, black: black };
	board = QueenAttack.init( config );
	
	return QueenAttack.canAttack( board );
}

run() === true; // true