View Subcategory
Lists
Modification

Remove an element from a list by index

Given the list [Apple, Banana, Carrot], remove the first element to produce the list [Banana, Carrot]
php
$list = array("Apple", "Banana", "Carrot");
unset($list[0]);

// Be aware of that $list[0] isn't set. "Banana" is still $list[1]
$list = array("Apple", "Banana", "Carrot");
array_shift($list);

// Be aware of that $list[0] is set to "Banana"
clojure
(let [fruit ["Apple" "Banana" "Carrot"]
index 0]
(concat
(take index fruit)
(drop (+ index 1) fruit)))
cpp
fruit->RemoveAt(0);

Remove the last element of a list

php
$list = array("Apple", "Banana", "Carrot");
unset($list[count($list)-1]);

// Be aware of that
// $list[] = "Orange";
// will be $list[3] and not $list[2]
$list = array("Apple", "Banana", "Carrot");
array_pop($list);
clojure
(pop ["Apple" "Banana" "Carrot"])
cpp
fruit->RemoveAt(fruit->Count - 1);

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"]
php
$list = array("Apple", "Orange", "Grapes", "Banana");
$first = array_shift($list); //get and remove the first
array_push($list, $first); //prepend the $first to the array
clojure
(let [fruit ["apple" "orange" "grapes" "bananas"]]
(concat (rest fruit) [(first fruit)])
cpp
fruit->Add(fruit[0]); fruit->RemoveAt(0);
rotate(fruit.begin(), fruit.begin()+1, fruit.end());