Editing
Control flow in Elixir
Jump to navigation
Jump to search
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
== Control Flow in Elixir == Control flow refers to the order in which statements and expressions are executed in a program. In Elixir, there are several constructs available for controlling the flow of execution, such as conditionals and loops. Understanding these control flow mechanisms is essential for writing efficient and readable Elixir code. === Conditionals === Conditionals allow you to make decisions based on certain conditions. Elixir provides the `if-else` construct to handle such scenarios. The general syntax for `if-else` in Elixir is: ```elixir if condition do # code to execute if condition is true else # code to execute if condition is false end ``` To handle multiple conditions, you can use the `case` statement. The `case` statement matches a value against a series of patterns and executes the corresponding code block for the first matching pattern. The syntax for `case` is as follows: ```elixir case value do pattern1 -> # code to execute if pattern1 matches pattern2 -> # code to execute if pattern2 matches _ -> # code to execute if no pattern matches end ``` === Loops === Loops allow you to repeat a set of instructions multiple times. Elixir offers different loop constructs depending on the specific use case. The `for` loop is useful for iterating over a collection and performing certain operations on each element. The basic syntax for a `for` loop is: ```elixir for element <- collection do # code to execute for each element end ``` To create an indefinite loop, you can use the `loop` construct. The `loop` function allows you to repeatedly execute a block of code until a particular condition is met. Here's an example: ```elixir loop do # code to execute if condition do # exit the loop if condition is true break end end ``` Elixir also provides the `Enum` module, which offers functions like `each`, `map`, and `reduce` for working with collections. These functions allow you to iterate over a collection, apply a function to each element, and perform various operations. === Exception Handling === Exception handling allows you to handle errors and exceptional conditions in your code. In Elixir, exceptions are raised using the `raise` function and can be rescued using the `try...catch` construct. The `try...catch` block is used to specify code that might raise an exception and provide a way to handle it. Here's the syntax: ```elixir try do # code that might raise an exception catch pattern1 -> # code to handle exception matching pattern1 pattern2 -> # code to handle exception matching pattern2 else # code to execute if no exception is raised after # code to execute regardless of exceptions end ``` === Conclusion === Understanding control flow in Elixir is crucial for writing reliable and efficient code. The constructs discussed in this article, such as conditionals, loops, and exception handling, provide the necessary tools for controlling the execution flow in your Elixir programs. By using these constructs effectively, you can ensure that your code behaves as expected and handles various scenarios gracefully. == See Also == * [[Pattern Matching in Elixir]] * [[Working with Collections in Elixir]] * [[Exception Handling in Elixir]]
Summary:
Please note that all contributions to Elixir Wiki may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see
Elixir Wiki:Copyrights
for details).
Do not submit copyrighted work without permission!
Cancel
Editing help
(opens in new window)
Navigation menu
Personal tools
Not logged in
Talk
Contributions
Create account
Log in
Namespaces
Page
Discussion
English
Views
Read
Edit
View history
More
Navigation
Main page
Recent changes
Random page
Help about MediaWiki
Tools
What links here
Related changes
Special pages
Page information