joint.all.js
function(elements, dimension) {

	return _.reduce(elements, function(max, el) { return Math.max(el.get('size')[dimension], max); }, 0);
    }
function(elements, dimension) {

	return _.reduce(elements, function(max, el) { return Math.max(el.get('size')[dimension], max); }, 0);
    }
function ( elements , dimension ) { return _ . reduce ( elements , function ( max , el ) { return Math . max ( el . get ( 'size' ) [ dimension ] , max ) ; } , 0 ) ; }
find maximal dimension (width/height) in an array of the elements
find maximal dimension ( width / height ) in an array of the elements