End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

String#bytesize

bytesize → integer

static VALUE
rb_str_bytesize(VALUE str)
{
    return LONG2NUM(RSTRING_LEN(str));
}

Returns the count of bytes in self:

Example

"\x80\u3042".bytesize # => 4
"hello".bytesize # => 5

See also #bytes #byteslice #b #capitalize also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0