method

local_variable_defined?

v2_1_10 - Show latest stable - 0 notes - Class: Binding

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What's this?

local_variable_defined?(p1) public

Returns a true if a local variable symbol exists.

def foo
  a = 1
  binding.local_variable_defined?(:a) #=> true
  binding.local_variable_defined?(:b) #=> false
end

This method is short version of the following code.

binding.eval("defined?(#{symbol}) == 'local-variable'")

Show source

static VALUE
bind_local_variable_defined_p(VALUE bindval, VALUE sym)
{
    ID lid = check_local_id(bindval, &sym);
    const rb_binding_t *bind;

    if (!lid) return Qfalse;

    GetBindingPtr(bindval, bind);
    return get_local_variable_ptr(bind->env, lid) ? Qtrue : Qfalse;
}

local_variable_defined?

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