Contenido del Curso
C# Beyond Basics
C# Beyond Basics
List Methods
In the previous chapter we learnt how to declare, initialize and add elements to a list. Additionally we also looked at how we would access elements of a list and loop through them. In this chapter we will look at some useful list methods.
1. Remove()
The Remove
method removes the first instance of an element from a list.
Syntax: exampleList.remove(targetElement);
index
In case no such element is found, it simply doesn't do anything:
index
2. RemoteAt()
The RemoveAt
method removes an element at a specific index.
Syntax: exampleList.RemoveAt(index);
index
3. Clear
The Clear
method simply removes all elements from a list. It takes no arguments.
Syntax: exampleList.Clear();
index
4. Insert
The Insert
method inserts an element in the list at a specified index.
Syntax: exampleList.Insert(index, elementToInsert);
index
We can omit the curly braces {}
in case there's only a single statement inside an if-condition, a for-loop, or a foreach loop. For-example:
index
The above snippet is the same as:
index
If there's already an element at the specified index, it is pushed to the right, and so are the remaining elements of the array after it - in case there are any. The following diagram illustrates the process:
5. Contains()
The Contains
method checks if a list contains a specific element. It returns a boolean value (true
or false
).
Syntax: exampleList.Contains(element);
index
6. IndexOf()
The IndexOf
method returns the index of the first occurrence of an element in a list.
Syntax: exampleList.IndexOf(element);
index
If the element doesn't exist in the list, it simply returns -1
:
The indexOf
method is especially useful when we want to access an element by index but we won't know it's index. For-example in the vowels
, we want to access the element o
by index and change it to capital O
:
index
¿Todo estuvo claro?