jquery - Assign different value if element exists -

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I am trying to allocate one of two values ​​in a variable, depending on whether an element Exists or not. I thought that something like this should work ... 

  $ optsH = function () (if (jq ('# option'). Length> gt; {return jq ('# Options') .outerHeight ();} and {return 0;}}   
 ... but not.  
 I know it should be simple , But it has been a long day.   
 
 
 Very well you forgot to call your function ; >   $ optsH = (function () {if (jQ ('#options'). Length> gt; return jQ ('# options'). OuterHeight ();} else { Return}}}} ()   
 If you do this however It is a better way to:  
  $ optsH = jQ ('# options'). OuterHeight () || 0;

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