Question

I want to replace the letter "e" with the number "3". I want "elijah".my_method() to return "3lijah".

I tried using sub and gsub methods along with replace, but none of these replaces the letter. Here is my code:

class String
  define_method(:leet_speak) do
    containsE = self.include?("e") 

    whereIsE = self.index("e")
    whereIsE.replace("3")
  end
end

Answer 1

The String#tr method lets you do multiple transformations at once.

So if you wanted to do all the leet alphabet:

'elijah'.tr('abcdefghijklmnopqrstuvwxyz', '48cd3f9h1jklmn0pqr57uvwxy2')

returns:

3l1j4h

Answer 2

None of the code you showed alters the original string (self) or returns an altered string. So nothing happens.

Try it like this (I have no idea why you're using define_method here, but I have no objection):

class String
  define_method(:leet_speak) do
    self.gsub("e","3")
  end
end

s = "elijah".leet_speak()

puts s # => 3lijah

Answer 3

case R.id.edt_d_o_birth: {
            KeyboardUtils.hideSoftKeyboard(this);
            Calendar calendar = Calendar.getInstance(Locale.getDefault());
            DatePickerDialog datePickerDialog = new DatePickerDialog(RegisterActivity.this,
                    new DatePickerDialog.OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                    //todo       
                }
            },calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH));
            datePickerDialog.show();
            break;
        }

String＃tr 方法对您来说已经足够......

How to replace a letter in a string with another letter

3 个答案: