How to detect if a button has been clicked OR an input's value has changed using jQuery? -

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My goal is to do something if the value of an input changes or a button is clicked.

I know how to apply these separately for example: 

  $ ('form: input') .change (function () {// something Do.}); $ ('Button'). Click (function () {// do something.});   
 But how can I apply them together? Here are some pseudo-code examples that I'm trying to achieve:  
  If (button is clicked) or (change input value) {// do something}    
 
 
 How to define a function and in the same case are calling the same function?  
 Something like this:  
  function f () {// your stuff} $ ('form: input'). Change (F); Click on $ ('button)' (f).

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