Knowledge Base Contributions

Below is a list of the knowledge base entries that Peter Parker has contributed to:

• when passing a parameter to a function that may or may not be another function how would you test the parameter to see if it is a function or not?
  

• when passing a variable number of parameters you have explained the use of the code 'arg0 = arg0 == void 0 ? 0 : arg0'. Please explain what it does?