Defaulting parameters to previous arguments

# P T Withington (17 years ago)

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Will es4 let me say this?

function select (start:Number, end:Number=start) { ... }

or do I have to resort to something like:

function select (start:Number, end:Numer=null) { if (end == null) { end = start; } ... }

Will es4 let me say this?

   function select (start:Number, end:Number=start) { ... }

or do I have to resort to something like:

   function select (start:Number, end:Numer=null) {
     if (end == null) { end = start; }
     ...
   }