in elisp's let, how do you reference a variable bound in the same let while binding another variable?

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太阳男子
太阳男子 2021-02-19 14:24
(let ((a 1) (b (+ a 1)))
  (message a))

This throws the error

Debugger entered--Lisp error: (void-variable a)

What\'s

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  •  伪装坚强ぢ
    2021-02-19 14:50

    The canonical way is to use let* (also note that I added a %s format string to your message form):

    (let* ((a 1) (b (+ a 1)))
      (message "%s" a))
    

    The let* function allows you to reference other variables that have previously been defined.

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