object
var blockContentTextHeight = $('.block-content-text').height(blockPictHeight - (blockContentDescHeight + blockContentSubtextHeight) );
console.log(typeof blockContentTextHeight);
height
со значением возвращается объект jQuery api.jquery.com/height/#height2 var blockContentTextHeight = blockPictHeight - (blockContentDescHeight + blockContentSubtextHeight)
$('.block-content-text').height( blockContentTextHeight );
var blockContentTextHeight = $('.block-content-text').height(blockPictHeight - (blockContentDescHeight + blockContentSubtextHeight) ).height();
console.log(typeof blockContentTextHeight);
$('div').height(200).css({
border: '1px solid #000',
backgroundColor: 'green'
});