[Solved] Why is my code’s ‘e’ not defined?

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Not are clean to me what you are trying to do in e function, but I build this example for help you:

var red = document.getElementById("colorRed")
  , blue = document.getElementById("colorBlue"); 

//document.write(red);

function e(){
  if(blue.checked == true){
    document.write("You prefer Blue");
  } else if (red.checked == true){
    document.write("You prefer Red");  
  } else {
    document.write("You prefer nothing");  
  }
}
<form>
  What color do you prefer?<br>
  <input type="radio" id="colorRed" >Red</input>
  <input type="radio" id="colorBlue" >Blue</input>
</form>

<button onclick="e()">far</button>

5

solved Why is my code’s ‘e’ not defined?