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Fail Fast! principle: debug less and create more reliable software

image
When an error occurs in an application, there are two diametrically opposite approaches to handling this error:
Forgive! approach: the application continues to run and tries to minimize the consequences of the error.
Fail Fast! approach: the application immediately stops working and reports an error.


To answer these questions, take a look at a simple example.

Suppose we have to write a simple web page that displays a warning next to the fountain that the water in it is polluted.
The following HTML code performs this task:
<html> <body> <h2 style="color:red;">Important!</h2> <p>Please <b>DO NOT</b> drink this water!</p> </body> </html>

The result of this code in the browser will look like this:
image

Now we will make a small mistake inside the HTML code.
Instead of a tag, we use a tag.
    DO NOT,    : 
 <p>Please <b>DO NOT<b> drink this water!</p> 
   : 
    ?   ? 
 
     .    HTML-  .      Firefox, Google Chrome, Internet Explorer, Opera  Safari   : 
 image 
 
 ,      Forgive!,             .    ,     ,   .          .   ! 
 
  :  Forgive!  ! 
 
     .      <b   DO NOT,  : 
 <p>Please <b DO NOT</b> drink this water!</p> 
      : 
 image 
 
   !       ,   ,   .  .  ,   ,   -. 
 
  :  Forgive!  ! 
 
      ,    -    .     ,  " "    . ,   Mariner 1      - " ".        List of software bugs . 
 
     ,     Forgive!           . ,       "  ?" 
 
    ,    . , ,   . 
  : 
       Fail fast!  
 
       : 
  Fail fast!   .   -   ,       ,   ,    .  , Fail fast!      .        ,        .  ,    ,    .   ,          . 
 
 ,   ,       .  ,   ---.  ,         Fail fast!  .     ,        ,  ,     ,    .      "",   .           ,    . ""   " ".     Fail fast! . 
 
        .               ,       ,        . ,   Fail fast!    ,       .      -     .     Forgive!     "    ". 
 
    -  Fail fast!,        . ,      ,          ,      (", ...       abc.tmp"),         . 
 
  : 
       Fail fast! .  : 
        Fail fast!.     ,           ,    ,        .  ,      ,    Forgive!     . 
 
 
       Rule of Repair  The Art of Unix Programming ,   : 
    -     ,      . 
 
          6    - ,   : 
         ,      ,               ,      "     ",      . 
 
   ,    -   ,   Fail fast! . ,     Fail fast! ,           .    ,                 ,        : 
 var table_row_index = 1 ... table_row_indx = table_row_index + 1 
 
        Fail fast!.    /            . 
 
      Fail fast! ,       .     : 
 ,        ,     ,   . 
 
      (=   +  + ),     ,             . 
 
   : 
  ,        ,   fail fast      fail fast  . 
     . 
      . Assert 
     .     fail fast       . 
  ,       - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
    DO NOT,    : 
 <p>Please <b>DO NOT<b> drink this water!</p> 
   : 
    ?   ? 
 
     .    HTML-  .      Firefox, Google Chrome, Internet Explorer, Opera  Safari   : 
 image 
 
 ,      Forgive!,             .    ,     ,   .          .   ! 
 
  :  Forgive!  ! 
 
     .      <b   DO NOT,  : 
 <p>Please <b DO NOT</b> drink this water!</p> 
      : 
 image 
 
   !       ,   ,   .  .  ,   ,   -. 
 
  :  Forgive!  ! 
 
      ,    -    .     ,  " "    . ,   Mariner 1      - " ".        List of software bugs . 
 
     ,     Forgive!           . ,       "  ?" 
 
    ,    . , ,   . 
  : 
       Fail fast!  
 
       : 
  Fail fast!   .   -   ,       ,   ,    .  , Fail fast!      .        ,        .  ,    ,    .   ,          . 
 
 ,   ,       .  ,   ---.  ,         Fail fast!  .     ,        ,  ,     ,    .      "",   .           ,    . ""   " ".     Fail fast! . 
 
        .               ,       ,        . ,   Fail fast!    ,       .      -     .     Forgive!     "    ". 
 
    -  Fail fast!,        . ,      ,          ,      (", ...       abc.tmp"),         . 
 
  : 
       Fail fast! .  : 
        Fail fast!.     ,           ,    ,        .  ,      ,    Forgive!     . 
 
 
       Rule of Repair  The Art of Unix Programming ,   : 
    -     ,      . 
 
          6    - ,   : 
         ,      ,               ,      "     ",      . 
 
   ,    -   ,   Fail fast! . ,     Fail fast! ,           .    ,                 ,        : 
 var table_row_index = 1 ... table_row_indx = table_row_index + 1 
 
        Fail fast!.    /            . 
 
      Fail fast! ,       .     : 
 ,        ,     ,   . 
 
      (=   +  + ),     ,             . 
 
   : 
  ,        ,   fail fast      fail fast  . 
     . 
      . Assert 
     .     fail fast       . 
  ,       - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .
    DO NOT,    : 
 <p>Please <b>DO NOT<b> drink this water!</p> 
   : 
    ?   ? 
 
     .    HTML-  .      Firefox, Google Chrome, Internet Explorer, Opera  Safari   : 
 image 
 
 ,      Forgive!,             .    ,     ,   .          .   ! 
 
  :  Forgive!  ! 
 
     .      <b   DO NOT,  : 
 <p>Please <b DO NOT</b> drink this water!</p> 
      : 
 image 
 
   !       ,   ,   .  .  ,   ,   -. 
 
  :  Forgive!  ! 
 
      ,    -    .     ,  " "    . ,   Mariner 1      - " ".        List of software bugs . 
 
     ,     Forgive!           . ,       "  ?" 
 
    ,    . , ,   . 
  : 
       Fail fast!  
 
       : 
  Fail fast!   .   -   ,       ,   ,    .  , Fail fast!      .        ,        .  ,    ,    .   ,          . 
 
 ,   ,       .  ,   ---.  ,         Fail fast!  .     ,        ,  ,     ,    .      "",   .           ,    . ""   " ".     Fail fast! . 
 
        .               ,       ,        . ,   Fail fast!    ,       .      -     .     Forgive!     "    ". 
 
    -  Fail fast!,        . ,      ,          ,      (", ...       abc.tmp"),         . 
 
  : 
       Fail fast! .  : 
        Fail fast!.     ,           ,    ,        .  ,      ,    Forgive!     . 
 
 
       Rule of Repair  The Art of Unix Programming ,   : 
    -     ,      . 
 
          6    - ,   : 
         ,      ,               ,      "     ",      . 
 
   ,    -   ,   Fail fast! . ,     Fail fast! ,           .    ,                 ,        : 
 var table_row_index = 1 ... table_row_indx = table_row_index + 1 
 
        Fail fast!.    /            . 
 
      Fail fast! ,       .     : 
 ,        ,     ,   . 
 
      (=   +  + ),     ,             . 
 
   : 
  ,        ,   fail fast      fail fast  . 
     . 
      . Assert 
     .     fail fast       . 
  ,       - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?

. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
image

, Forgive!, . , , . . !

: Forgive! !

. <b DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
image

! , , . . , , -.

: Forgive! !

, - . , " " . , Mariner 1 - " ". List of software bugs .

, Forgive! . , " ?"

, . , , .
:
Fail fast!

:
Fail fast! . - , , , . , Fail fast! . , . , , . , .

, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .

. , , . , Fail fast! , . - . Forgive! " ".

- Fail fast!, . , , , (", ... abc.tmp"), .

:
Fail fast! . :
Fail fast!. , , , . , , Forgive! .


Rule of Repair The Art of Unix Programming , :
- , .

6 - , :
, , , " ", .

, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1

Fail fast!. / .

Fail fast! , . :
, , , .

(= + + ), , .

:
, , fail fast fail fast .
.
. Assert
. fail fast .
, - .

')

Source: https://habr.com/ru/post/218325/

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