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simple loop in coffeescript
count = $content.find('.post').length;
for x in [1...count]
    /*
    prev_el_height += $("#content .post:nth-child(" + x + ")").height();
    */
    prev_el_height += $content.find(".post:nth-child(" + x + ")").height();

for (x = 1; x < count; x++) { prev_el ... }

for (x = 1; 1 <= count ? x < count : x > count; 1 <= count ? x++ : x--) {

for x in [1...count] by 1
  ...

for (x = 1; x < count; x++) { /* ... */ }

for (x = 1; x > count; x--) { /* ... */ }

$('#content .post').each ->
    prev_el_height += $(this).height()