Community documentation for Janet

(/ 2)
# => 0.5

(merge {:a 1 :b 2})

#=> @{:a 1 :b 2} 
# good way to convert struct to table

(in "yo" 0)
# => 121

(math/ceil 1.1)  # => 2
(map math/ceil [1.1 1.2 1.3])  # => @[2 2 2]

(defn greet-me [] (print "hey programmer!"))
(defn greet-stranger [] (print "hey stranger!"))

(varfn greet [] (greet-me))
(greet) # prints "hey programmer!"
(varfn greet [] (greet-stranger))
(greet) # prints "hey stranger!"

# kind of analogous to (def greet (fn [] (some-thunk))), but with built-in
# sugar to automatically update 'greet' if varfn is called with a name
# already bound

(fiber/root) # => <fiber 0x562FF22F10A0> your hex number will differ

(any? [false false nil]) => nil
(any? [false false nil 1]) => 1
(any? [false false nil true]) => true

# sh/$'s contents are quasiquoted, allowing direct or string arguments
# so you need to unquote , variables:

(def out (file/open "trust-db.txt" :w))
(sh/$ "gpg" "--export-ownertrust" > ,out) # > requires an opened file object
(file/close out)

# note how > requires an opened file object
(with [out (file/open "trust-db.txt" :w)]
  (sh/$ gpg --export-ownertrust > ,out))

(map bytes?      [ 'ab   :ab   "ab"   @"ab"  [97 98]  @[97 98]  {0 97 1 98}  @{0 97 1 98}  ])
# =>            @[ true  true  true   true   false    false     false        false         ]

(map symbol?     [ 'ab   :ab   "ab"   @"ab"  [97 98]  @[97 98]  {0 97 1 98}  @{0 97 1 98}  ])
# =>            @[ true  false false  false  false    false     false        false         ]

(map keyword?    [ 'ab   :ab   "ab"   @"ab"  [97 98]  @[97 98]  {0 97 1 98}  @{0 97 1 98}  ])
# =>            @[ false true  false  false  false    false     false        false         ]

(map string?     [ 'ab   :ab   "ab"   @"ab"  [97 98]  @[97 98]  {0 97 1 98}  @{0 97 1 98}  ])
# =>            @[ false false true   false  false    false     false        false         ]

(map buffer?     [ 'ab   :ab   "ab"   @"ab"  [97 98]  @[97 98]  {0 97 1 98}  @{0 97 1 98}  ])
# =>            @[ false false false  true   false    false     false        false         ]

(map truthy? [ nil   false true  0     1     'a    :a    "a"   []    {}    (fn []) ])
# =>        @[ false false true  true  true  true  true  true  true  true  true    ]

# note that 'not' works as an implementation of 'falsey?'
(map not     [ nil   false true  0     1     'a    :a    "a"   []    {}    (fn []) ])
# =>        @[ true  true  false false false false false false false false false   ]

(defn read-from-file [file-path]
  (let [f (file/open file-path :r)
        content  (file/read f :all)]
    (file/close f)
    content))

### USAGE 

(read-from-file "/path/to/file-read-example.janet")
# => @"(defn read-from-file [file-path]\n  (let [f (file/open file-path :r)\n        content  (file/read f :all)]\n    (file/close f)\n    content))\n"

(bor 1 2 4)  # => 7
(bor 7 12)  # => 15

#    0111   (7)
# or 1100  (12)
# -------
#    1111  (15)

(map math/abs   [-2.9 -2.1 2.1 2.9])  # => @[ 2.9  2.1  2.1  2.9 ]
(map math/floor [-2.9 -2.1 2.1 2.9])  # => @[ -3   -3   2    2   ]
(map math/ceil  [-2.9 -2.1 2.1 2.9])  # => @[ -2   -2   3    3   ]
(map math/round [-2.9 -2.1 2.1 2.9])  # => @[ -3   -2   2    3   ]
(map math/trunc [-2.9 -2.1 2.1 2.9])  # => @[ -2   -2   2    2   ]

(def a @[11 12])              # => @[11 12]
(array/insert a 0 10)         # => @[10 11 12]
(array/insert a 3 13)         # => @[10 11 12 13]
(array/insert a -1 14)        # => @[10 11 12 13 14]
(array/insert a -1 15 16 17)  # => @[10 11 12 13 14 15 16 17]

# From: https://codeberg.org/veqq/janetdocs/src/commit/54a964d1a35920af2655c4932a9b51379e8b9380/helpers.janet#L52

(defn current-account [request]
  (def login (get-in request [:session :login] ""))
  (joy/db/find-by :account :where {:login login}))