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tuple.eo
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tuple.eo
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# The MIT License (MIT)
#
# Copyright (c) 2016-2024 Objectionary.com
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
+architect yegor256@gmail.com
+home https://github.com/objectionary/eo
+package org.eolang
+rt jvm org.eolang:eo-runtime:0.0.0
+version 0.0.0
# Tuple.
[head tail] > tuple
# Empty tuple.
[] > empty
# Take one element from the tuple, at the given position.
[i] > at
error "Can't get an object from the empty tuple" > @
# Take one element from the tuple, at the given position.
[x] > with
tuple > @
tuple.empty
x
0 > length
# Obtain the length of the tuple.
[] > length!
^.head.length.plus 1 > @
# Take one element from the tuple, at the given position.
[i] > at
i > idx!
^.length > len!
if. > index!
idx.lt 0
len.plus idx
idx
if. > @
or.
index.lt 0
index.gte len
error "Given index is out of tuple bounds"
at-without-checks index
# Takes element from the tuple without index validation.
# Here "i" must be an object that can be comparable with "int" using "lt" attribute.
[i] > at-without-checks
i > idx!
if. > @
idx.lt head.length
^.^.head.at.at-without-checks idx
^.^.tail
# Create a new tuple with this element added to the end of it.
[x] > with
tuple > @
^
x