Method: Kernel#local_variables

Defined in:
vm_eval.c

#local_variables ⇒ Array

Returns the names of the current local variables.

fred = 1
for i in 1..10
   # ...
end
local_variables   #=> [:fred, :i]

Returns:



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# File 'vm_eval.c', line 2484

static VALUE
rb_f_local_variables(VALUE _)
{
    struct local_var_list vars;
    rb_execution_context_t *ec = GET_EC();
    rb_control_frame_t *cfp = vm_get_ruby_level_caller_cfp(ec, RUBY_VM_PREVIOUS_CONTROL_FRAME(ec->cfp));
    unsigned int i;

    local_var_list_init(&vars);
    while (cfp) {
	if (cfp->iseq) {
	    for (i = 0; i < cfp->iseq->body->local_table_size; i++) {
		local_var_list_add(&vars, cfp->iseq->body->local_table[i]);
	    }
	}
	if (!VM_ENV_LOCAL_P(cfp->ep)) {
	    /* block */
	    const VALUE *ep = VM_CF_PREV_EP(cfp);

	    if (vm_collect_local_variables_in_heap(ep, &vars)) {
		break;
	    }
	    else {
		while (cfp->ep != ep) {
		    cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
		}
	    }
	}
	else {
	    break;
	}
    }
    return local_var_list_finish(&vars);
}