javascript - How would you check for undefined property in ejs for node.js? -

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What is the best way to check an undefined property in the EJS template?

(I '

Example: 

  var tpl =' & lt;% if (foo) {%> defined Foo & lt ;%} Other {%> Foo undefined & lt;%}% & gt; '; Console.log (ejs.render (tpl, {local: {time: "falcon"}})));   
 I hope it has to render "foo undefined" instead it throws an  foo undefined  error.  
 I know that this is not an issue because it is expected behavior.  
  var tpl = '& lt;  
  
  
% (hypoproperty ("foo")) {%> defined foo & lt;%} other {%> Foo undefined & lt;%}% & gt; '; Console.log (ejs.render (tpl, {local: {time: "falcon"}})));   
 It does not make any errors.  
 Is there a better way to keep the template clean? Or why this error is thrown?  "post-text" itemprop = "text"> 
 Another way to test for an asset is indirectly referred to as  local  objects for example :  
  var tpl = '& lt;% if (localals.foo) {%> Foo defined & lt;%} other {%> Foo undefined & lt;%}% & gt; ; Console.log (ejs.render (tpl, {local: {time: "falcon"}})));

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