Overriding a function in a Wordpress child theme?

Question

WordPress

In the parent theme, the function is simply declared, without the use of function_exists:

if( ! function_exists('theme_function') ){
  function theme_function() {
    // Код.
  }
}

It turns out that there is no way to redefine the function in the child theme, but there is no point in adding if !function_exists to the parent theme, since this change will be erased when the theme is updated anyway.
Is there anything else that can be done in this case?

Answer 1

1. If the function uses hooks or is attached to hooks, unbind and attach your function.
2. If displayed in a template, redefine the template.