function offsets( arrays ) {
	var out = [];
	var i;
	for ( i = 0; i < arrays.length; i++ ) {
		out.push( arrays[ i ].offset );
	}
	return out;
}
Resolves index offsets from a list of ndarray-like objects.

@private
@param {ArrayLikeObject<Object>} arrays - list of ndarray-like objects
@returns {NonNegativeIntegerArray} list of offsets