Get function parameter names for interface purposes

Question

can anyone help me on how to retrieve function parameter names? For example:

var A = function(a, b, c) {};

I need to get the parameter name

Answer 1

Just to make complete @jerjer answer, We may also ensure there is at least one match:

function getFnParamNames(fn){
  const match = fn.toString().match(/\(.*?\)/) 
  return match ? match[0].replace(/[()]/gi,'').replace(/\s/gi,'').split(',') : [];
}