Ruby Hash classs method has_key? vs method member?

Question

Is there any difference between the two methods for the Ruby Hash, or is it just "there is more than 1 way to do it"?
I could not see any measureable difference between the two.
Thanks,

As per apidock.com/ruby/Hash/has_key%3F and ruby-doc.org/core-2.4.0/Hash.html#method-i-member-3F, they look to return the same results. — Jagdeep Singh
– Jagdeep Singh, Commented Mar 20, 2018 at 13:10
FYI Hash.instance_method(:has_key?) == Hash.instance_method(:member?) #=> true — Stefan
– Stefan, Commented Mar 20, 2018 at 13:24

vcsjones · Accepted Answer · 2018-03-20 13:12:20Z

11

According to the Ruby source, has_key?, key?, include? and member? are the same implementation.

answered Mar 20, 2018 at 13:12

vcsjones

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lacostenycoder · Accepted Answer · 2018-03-20 13:26:54Z

To see the method definition's source code see documentation, find the method you're looking for then click on the method to expand to see the actual source code:

https://ruby-doc.org/core-2.5.0/Hash.html#method-i-member-3F

    rb_hash_has_key(VALUE hash, VALUE key)
    {
        if (!RHASH(hash)->ntbl)
            return Qfalse;
        if (st_lookup(RHASH(hash)->ntbl, key, 0)) {
            return Qtrue;
        }
        return Qfalse;
    }

https://ruby-doc.org/core-2.5.0/Hash.html#method-i-has_key-3F

    rb_hash_has_key(VALUE hash, VALUE key)
    {
        if (!RHASH(hash)->ntbl)
            return Qfalse;
        if (st_lookup(RHASH(hash)->ntbl, key, 0)) {
            return Qtrue;
        }
        return Qfalse;
    }

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