[jQuery] how to create a function in jquery?

[phpcurious]

I wanted to create a function that will return an array consisting
values from 3 textboxes.

let's say:

$('document').ready(function() {


        $('input#button_a').click(function() {
              a = $('input#input_text_a').val();
              b = $('input#input_text_b').val();
              c = $('input#input_text_c').val();
           });

          $('input#button_b').click(function() {
              a = $('input#input_text_a').val();
              b = $('input#input_text_b').val();
              c = $('input#input_text_c').val();
           });
         $('input#button_c').click(function() {
              a = $('input#input_text_a').val();
              b = $('input#input_text_b').val();
              c = $('input#input_text_c').val();
           });

});

is there a way I can create the function within this jquery script? or
is there a workaround?
please teach me, I am new in this aspect. thank you in advance!