function_exists

  • We can check if a method exists in Ruby by seeing if an object responds to a message by that method’s name. We do this using the Object#respond_to? method which takes a single argument using a symbol of the method we’re checking.

    PHP

    function foo() {}
 
$result = function_exists('foo');
var_export($result);
// => true
 
$result = function_exists('bar');
var_export($result);
// => false

    Ruby

    def foo; end
 
p respond_to?(:foo)
# => true
 
p respond_to?(:bar)
# => false

    see also

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