Feature #16833 ยป add-enumerable-empty.patch
| enum.c | ||
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}
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}
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/*
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* call-seq:
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* enum.empty? -> true or false
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*
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* Returns true if enumerable is empty?
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*
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* [].to_enum.empty? #=> true
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* [nil].to_enum.empty? #=> false
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* [false].to_enum.empty? #=> false
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* [1, 2, 3].to_enum.empty? #=> false
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*
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*/
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static VALUE
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enum_empty(VALUE obj)
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{
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long len = RARRAY_LEN(enum_to_a(0, 0, enum_take(obj, INT2FIX(1))));
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return len == 0 ? Qtrue : Qfalse;
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}
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/*
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* call-seq:
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| ... | ... | |
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rb_define_method(rb_mEnumerable, "group_by", enum_group_by, 0);
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rb_define_method(rb_mEnumerable, "tally", enum_tally, 0);
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rb_define_method(rb_mEnumerable, "first", enum_first, -1);
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rb_define_method(rb_mEnumerable, "empty?", enum_empty, 0);
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rb_define_method(rb_mEnumerable, "all?", enum_all, -1);
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rb_define_method(rb_mEnumerable, "any?", enum_any, -1);
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rb_define_method(rb_mEnumerable, "one?", enum_one, -1);
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| test/ruby/test_enum.rb | ||
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assert_equal(true, {a: 1, b: 2}.any?(->(kv) { kv == [:b, 2] }))
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end
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def test_empty
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assert_equal(true, [].to_enum.empty?)
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assert_equal(true, @empty.empty?)
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assert_equal(false, @obj.empty?)
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assert_equal(false, [nil].to_enum.empty?)
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assert_equal(false, [0].to_enum.empty?)
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assert_equal(false, [false].to_enum.empty?)
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assert_equal(false, (1..Float::INFINITY).lazy.empty?)
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end
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def test_any_with_unused_block
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assert_in_out_err [], <<-EOS, [], ["-:1: warning: given block not used"]
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[1, 23].any?(1) {|x| x == 1 }
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