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Remove an element from a list by index
Given the list
[Apple, Banana, Carrot], remove the first element to produce the list [Banana, Carrot]
perl
@list = qw(Apple Banana Carrot);
shift @list;
shift @list;
@list = qw(Apple Banana Carrot);
$offset = 0;
splice(@list, $offset, 1);
$offset = 0;
splice(@list, $offset, 1);
java
list.remove(0);
clojure
(let [fruit ["Apple" "Banana" "Carrot"]
index 0]
(concat
(take index fruit)
(drop (+ index 1) fruit)))
index 0]
(concat
(take index fruit)
(drop (+ index 1) fruit)))
Remove the last element of a list
perl
pop @list;
java
list.remove(list.size() - 1);
clojure
(pop ["Apple" "Banana" "Carrot"])
Rotate a list
Given a list
["apple", "orange", "grapes", "bananas"], rotate it by removing the first item and placing it on the end to yield ["orange", "grapes", "bananas", "apple"]
perl
@list = qw(apple, orange, grapes, bananas);
push @list, shift @list;
push @list, shift @list;
@list = qw(apple orange grapes bananas);
@list = @list[1..$#list,0];
@list = @list[1..$#list,0];
java
list.add(list.remove(0));
Collections.rotate(list, -1);
clojure
(let [fruit ["apple" "orange" "grapes" "bananas"]]
(concat (rest fruit) [(first fruit)])
(concat (rest fruit) [(first fruit)])
