The List type is a mutable sequence type that allows you to store and manipulate a collection of values. It is similar to arrays in other programming languages. Lists are created using square brackets, and elements can be added, removed, or modified using various methods.
Properties
List.len: the number of elements in a list.
Example
var my_list = [1, 2, 3, 4]
print(my_list.len) // 4
List.add
The List.add method adds an element to the end of a list.
Syntax
List.add(element)Parameters
element: The element to add to the end of the list.
Return Value
None.
Example
var my_list = [1, 2, 3]
my_list.add(4)
print(my_list) // [1, 2, 3, 4]
List.remove
The List.remove method removes the first occurrence of a value from a list. If the value is not found in the list, an error is raised.
Syntax
List.remove(value)Parameters
value: The value to remove from the list.
Return Value
None.
Example
var my_list = [1, 2, 3, 4, 2]
my_list.remove(2)
print(my_list) // [1, 3, 4, 2]
List.delete
The List.delete method removes the element at a specified index from a list. If the index is out of range, an error is raised.
Syntax
List.delete(index)Parameters
index: The index of the element to remove from the list.
Return Value
None.
Example
var my_list = [1, 2, 3, 4]
my_list.delete(1)
print(my_list) // [1, 3, 4]
List.clear
The List.clear method removes all elements from a list.
Syntax
List.clear()Parameters
None.
Return Value
None.
Example
var my_list = [1, 2, 3, 4]
my_list.clear()
print(my_list) // Output: []
List.insert
The List.insert method inserts an element at a specified index in a list. If the index is out of range, an error is raised.
Syntax
List.insert(index, element)Parameters
index: The index at which to insert the element.element: The element to insert into the list.
Return Value
None.
Example
var my_list = [1, 2, 3]
my_list.insert(1, 4)
print(my_list) // [1, 4, 2, 3]
List.extend
The List.extend method adds all elements of an iterable to the end of a list.
Syntax
List.extend(iterable)Parameters
iterable: The iterable whose elements to add to the end of the list.
Return Value
None.
Example
var my_list = [1, 2, 3]
my_list.extend([4, 5, 6])
print(my_list) // [1, 2, 3, 4, 5, 6]
List.reverse
The List.reverse method reverses the order of elements in a list.
Syntax
List.reverse()Parameters
None.
Return Value
None.
Example
var my_list = [1, 2, 3, 4]
my_list.reverse()
print(my_list) // [4, 3, 2, 1]
List.contains
The List.contains checks whether an element is present in a list or not.
Syntax
List.contains(element)Parameters
element: The element to search for in the list.
Return Value
A boolean indicating whether the element is present in the list.
Example
var my_list = [1, 2, 3, 4]
print(my_list.contains(2)) // true
print(my_list.contains(5)) // false
List.count
The List.contains checks whether an element is present in a list or not.
Syntax
List.count(element)Parameters
element: The element to count in the list.
Return Value
The number of times the element appears in the list.
Example
var my_list = [1, 2, 2, 3, 3, 3, 4]
print(my_list.count(2)) // 2
print(my_list.count(3)) // 3
print(my_list.count(4)) // 1
print(my_list.count(5)) // 0
List.swap
The List.contains checks whether an element is present in a list or not.
Syntax
List.swap(index1, index2)Parameters
index1: The index of the first element to swap.index2: The index of the second element to swap.
Return Value
None.
Example
var my_list = [1, 2, 3, 4]
my_list.swap(0, 3)
print(my_list) // [4, 2, 3, 1]
List.fill
The List.fill method fills a list with a given value.
Syntax
List.fill(value)Parameters
value: The value to fill the list with.
Return Value
None.
Example
var my_list = [1, 2, 3]
my_list.fill(0)
print(my_list) // [0, 0, 0]
List.sort
The List.sort method sorts the elements of a list in ascending order.
Syntax
List.sort()Parameters
None.
Return Value
None.
Example
var my_list = [3, 2, 1]
my_list.sort()
print(my_list) // [1, 2, 3]
List.index
The List.index method returns the index of the first occurrence of a given value in a list. If the value is not found in the list, an error is raised.
Syntax
List.index(value)Parameters
value: The value to search for in the list.
Return Value
The index of the first occurrence of value in the list.
Example
var my_list = [1, 2, 3, 2]
index = my_list.index(2)
print(index) // 1
List.join
The List.join method returns a string obtained by concatenating the elements of a list, using a separator string.
Syntax
List.join(separator)Parameters
separator: The string to use as a separator between the elements of the list.
Return Value
A string obtained by concatenating the elements of the list, using separator as a separator.
Example
var my_list = ['a', 'b', 'c']
result = my_list.join(', ')
print(result) // 'a, b, c'
List.copy
The List.copy method returns a shallow copy of a list. A shallow copy is a new list that contains references to the elements of the original list, rather than copies of the elements themselves.
Syntax
List.copy()Parameters
None.
Return Value
A shallow copy of the list.
Example
var my_list = [1, 2, 3]
copy = my_list.copy()
print(copy) // [1, 2, 3]