method

constants

v1_9_2_180 - Show latest stable - Class: Module

constants(*args)

public

Returns an array of the names of all constants defined in the system. This list includes the names of all modules and classes.

p Module.constants.sort[1..5]

produces:

["ARGV", "ArgumentError", "Array", "Bignum", "Binding"]

static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
    const NODE *cref = rb_vm_cref();
    VALUE klass;
    VALUE cbase = 0;
    void *data = 0;

    if (argc > 0) {
        return rb_mod_constants(argc, argv, rb_cModule);
    }

    while (cref) {
        klass = cref->nd_clss;
        if (!NIL_P(klass)) {
            data = rb_mod_const_at(cref->nd_clss, data);
            if (!cbase) {
                cbase = klass;
            }
        }
        cref = cref->nd_next;
    }

    if (cbase) {
        data = rb_mod_const_of(cbase, data);
    }
    return rb_const_list(data);
}

constants

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