title: What is the arity of , operator?
body: <p>Arity is the number of operand(s) an operator can take. For example, <code>+</code>, <code>-</code>, <code>*</code> and <code>&amp;</code> are the operators that can be used as both unary (one operand) and binary (two operands). <code>?:</code> is the only operator which takes three operands (that's why it is called ternary operator). </p>
  
  <p>But what is the arity of <code>,</code> (comma) operator? </p>