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Erlang / OTP Behaviours

handle_info

Learn handle_info in Erlang through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.

12 min read • Intermediate

handle_info is a focused Erlang lesson inside OTP Behaviours. The example uses the construct named in the lesson directly rather than reusing a generic placeholder.

Trace the example from its inputs through handle_info and identify the behavior that would change if that construct were removed or replaced. Pay attention to the language-specific rules shown by the syntax, because neighboring lessons intentionally exercise different mechanisms.

Topic-specific example

erlang-0044-1157c15367.erl
erlang Try It Live 
-module(example).
-export([run/0]).
run() -> lists:sum([45,46,47]). % handle_info
Edge case / engineering note

For handle_info, test one realistic boundary: empty data, invalid input, unavailable resources, lifetime/cleanup, type constraints, or concurrency timing where applicable. A successful happy path is not enough to prove the construct is used correctly.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

handle_info Mastery Check →
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supervisor child specs