janet tidbits

tidbits.janet

# `(next x)` can be used as a synonym for `(not (empty? x))`

# if `next` returns `nil`, the argument is empty.
(next [])
# =>
nil

# if `next` returns non-nil, the argument is not empty.
(next [:a :b])
# =>
0

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# `(invert x)` can be used to create a "pseudo-set"

# pass an indexed type to `invert` to get back a table
(invert [:a :b])
# =>
@{:a 0 :b 1}

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# `(os/stat p)` can be used to check if a path exists

# with a second argument of `:mode`, gets an indication of what
(os/stat "/" :mode)
# =>
:directory

# if `os/stat` returns `nil` for some path, that path has no associated file/dir/etc.
(os/stat "non-existent")
# =>
nil

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