`when-let' (was: Re: My read-buffer-function doesn't work when called by switch-to-buffer)

[Emanuel Berg]

Tassilo Horn wrote:

> (when-let ((result (completing-read [...] ))))

`when-let' is so cool!

I didn't use it once. But I used `let' 457 times, and `when'
161 times.

So what about this

(setq initial-scratch-message nil)
(when-let ((buf (get-buffer "*scratch*")))
  (kill-buffer buf) )

?

There is also `if-let'. But no "unless-let". Yeah, like if all
of these are nil, then do something with them ...

There are also the sequential/non-"parallel"/self-refering
`when-let*' and `if-let*'!

Actually, there are

  and-let*
  cl--loop-let
  if-let[*]
  macroexp-let*
  macroexp-let2[*]
  map-let
  named-let
  pcase-let[*]
  rx-let
  seq-let
  when-let[*]
  while-let

and more!

I have 6 `pcase-let' and 1 `pcase-let*' and - now -
1 `when-let'.

Yeah - it's not a lot :(

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