Hash#to_h

() -> ::Hash[K, V]

[A, B] () { (K, V) -> [ A, B ] } -> ::Hash[A, B]

hash.to_h → self or new_hash

hash.to_h {|key, value| ... } → new_hash

static VALUE
rb_hash_to_h(VALUE hash)
{
    if (rb_block_given_p()) {
        return rb_hash_to_h_block(hash);
    }
    if (rb_obj_class(hash) != rb_cHash) {
        const VALUE flags = RBASIC(hash)->flags;
        hash = hash_dup(hash, rb_cHash, flags & RHASH_PROC_DEFAULT);
    }
    return hash;
}

For an instance of Hash, returns self.

For a subclass of Hash, returns a new Hash containing the content of self.

When a block is given, returns a new Hash object whose content is based on the block; the block should return a 2-element Array object specifying the key-value pair to be included in the returned Array:

Example

h = {foo: 0, bar: 1, baz: 2}
h1 = h.to_h {|key, value| [value, key] }
h1 # => {0=>:foo, 1=>:bar, 2=>:baz}

See also #to_a #to_hash #store #to_proc also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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