End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Hash#select
hash.select {|key, value| ... } → new_hash
hash.select → new_enumerator
hash.c
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static VALUE
rb_hash_select(VALUE hash)
{
VALUE result;
RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
result = hash_dup_with_compare_by_id(hash);
if (!RHASH_EMPTY_P(hash)) {
rb_hash_foreach(result, keep_if_i, result);
}
return result;
}
Hash#filter is an alias for Hash#select.
Returns a new Hash object whose entries are those for which the block returns a truthy value:
Example
h = {foo: 0, bar: 1, baz: 2} h.select {|key, value| value < 2 } # => {:foo=>0, :bar=>1}
Returns a new Enumerator if no block given:
Example
h = {foo: 0, bar: 1, baz: 2} e = h.select # => #<Enumerator: {:foo=>0, :bar=>1, :baz=>2}:select> e.each {|key, value| value < 2 } # => {:foo=>0, :bar=>1}