error handling

gistfile1.txt

  5 recipes.prototype.getRecipe·=·function·getRecipe(name)·{§
  6 ····if·(typeof this.recipe[name]·!==·'undefined')·{§
  7 ········return·this.recipe[name];§
  8 ····}§
  9 ····else·{§
 10 ········return·name·+·'·not_found';§
 11 ····};§
 12 }§
 
 
 I'd like for this to still work.  
recipes.prototype.createRecipe = function createRecipe(name, size) {
    if(!this.getRecipe(name)) {
       // do work 
    }
}