ERLANG / RELIABILITY AND STRUCTURE
Error tuples, exits, links, and monitors
Learn how error tuples, exits, links, and monitors works in Erlang, why the underlying model matters, and how to apply it in a small program without hiding important trade-offs.
What you will learn
- Explain error tuples in Erlang using the correct mental model
- Trace a focused Erlang example and predict its result before execution
- Recognize a boundary case involving exits and handle it deliberately
Understanding Error tuples, exits, links, and monitors
Error tuples, exits, links, and monitors belongs to the practical core of Erlang. Start by identifying the values or state involved and the rule that connects the input to the result.
Trace the example one operation at a time. Keep error tuples visible in the code rather than hiding it behind an abstraction before the behavior is understood.
Test a normal case and a boundary case. The difference between the prediction and the observed result is the most useful signal for deciding what to review next.
Error tuples, exits, links, and monitors is a defining part of practical Erlang work. Start by identifying the data or state involved, then trace the operation that changes or interprets it. Pay attention to the rules Erlang applies at this boundary, because those rules explain both the useful behavior and the common failure modes. This lesson keeps the example deliberately small, then connects it to modules, applications, releases, and rebar3 so the ideas form a coherent progression rather than a list of isolated syntax facts.
Worked examples
Error tuples, exits, links, and monitors example
A focused Erlang example for error tuples.
-module(main).
-export([start/0]).
start() -> io:format("Hello from Erlang~n").
// Lesson 11: error tuples. Change one value and predict the result before running it.Example explained
Line 1Identify where error tuples appears in the Erlang example and name the data it operates on.
Line 2Trace the relevant Erlang rule one operation at a time, recording any state, type, or control-flow change.
Line 3Change one input or boundary condition, predict the result, and compare that prediction with the documented outcome.
Important notes
Keep the first error tuples example small enough to trace completely.
Use the normal Erlang toolchain or browser workspace to compare the actual result with your prediction.
Common mistakes
Treating error tuples as punctuation to memorize instead of a Erlang behavior to reason about.
Ignoring exits until it appears in production data or a larger program.
Try it yourself
Change, predict, then run
Create a small Erlang example that demonstrates error tuples. Add a normal case and a boundary case, write down the expected result for each, then explain which Erlang rule produces that result. Lesson 11 should remain small enough to trace without guessing.
Open Erlang workspaceCheck your understanding
What is the best first step when working with error tuples?
- Identify the data and predict the result
- Add more abstraction immediately
- Ignore boundary cases
- Memorize punctuation only
Show answer
A clear input, operation, and predicted result create a testable mental model.