init -package:rio

Return all the elements of a list except the last one. The list must be non-empty. WARNING: This function is partial. Consider using unsnoc instead.

Examples

>>> init [1, 2, 3]
[1,2]

>>> init [1]
[]

>>> init []
*** Exception: Prelude.init: empty list

Extract everything except the last element of the stream.

O(1) Returns all the elements of a ByteString except the last one. An exception will be thrown in the case of an empty ByteString. This is a partial function, consider using unsnoc instead.

O(n/c) Returns all the elements of a ByteString except the last one. This is a partial function, consider using unsnoc instead.

O(n) Return all the elements of a ShortByteString except the last one. An exception will be thrown in the case of an empty ShortByteString. This is a partial function, consider using unsnoc instead. Note: copies the entire byte array

O(1) Returns all but the last character of a Text, which must be non-empty. This is a partial function, consider using unsnoc instead.

O(1) Returns all but the last character of a Stream Char, which must be non-empty. Properties

unstream . init . stream = init

O(n/c) Returns all but the last character of a Text, which must be non-empty. This is a partial function, consider using unsnoc instead.

Call hc-pkg to initialise a package database at the location {path}.

hc-pkg init {path}

Return all the elements of a list except the last one. The list must be non-empty.

>>> init [1, 2, 3]
[1,2]

>>> init [1]
[]

>>> init []
*** Exception: Prelude.init: empty list

WARNING: This function is partial. You can use reverse with case-matching or uncons instead.

init a context

init a context

O(n). Return all the elements of a NonEmpty list except the last one element. Actual type of this function is the following:

init :: NonEmpty a -> [a]

but it was given a more complex type to provide friendlier compile time errors.

>>> init ('a' :| "bcde")
"abcd"

>>> init [0..5 :: Int]
...
... 'init' works with 'NonEmpty', not ordinary lists.
Possible fix:
Replace: [Int]
With:    NonEmpty Int
...
However, you can use 'init' with the ordinary lists.
Apply 'viaNonEmpty' function from relude:
viaNonEmpty init (yourList)
Note, that this will return 'Maybe [Int]'
therefore it is a safe function unlike 'init' from the standard Prelude
...

>>> init (Just 'a')
...
... 'init' works with 'NonEmpty Char' lists
But given: Maybe Char
...

Safe version of initEx, only working on non-nullable sequences.

Return all the elements of a list except the last one. The list must be non-empty.

>>> init [1, 2, 3]
[1,2]

>>> init [1]
[]

>>> init []
*** Exception: Prelude.init: empty list

Drop last character from non-empty ShortText.

>>> tail "abcd"
"bcd"

Note: Will throw an error exception for empty ShortTexts. Consider using the total functions unsnoc or dropEnd instead.

Attempts to initialize the GLFW library. When the library is not initialized, the only allowed functions to call are getVersion, getVersionString, setErrorCallback, init, and terminate. Returns if the initialization was successful or not. See glfwInit and Initialization and Termination

create a new hash context

All elements of the list except the last one. See also inits.

O(1) Returns all but the last character of a JSString, which must be non-empty. Subject to fusion.

Return all the elements of a list except the last one. The list must be non-empty.