public function argument($name, $mode = null, $description = '', $default = null)
    {
        $argument = new InputArgument($name, $mode, $description, $default);
        $this->addArgument($argument);

        return $this;
    }
public function argument($name, $mode = null, $description = '', $default = null)
    {
        $argument = new InputArgument($name, $mode, $description, $default);
        $this->addArgument($argument);

        return $this;
    }
public function argument ( $ name , $ mode = null , $ description = '' , $ default = null ) { $ argument = new InputArgument ( $ name , $ mode , $ description , $ default ) ; $ this -> addArgument ( $ argument ) ; return $ this ; }
Add an argument

@param  string $name
@param  null          $mode
@param  string        $description
@param  null          $default
@return InputDefinition
Add an argument