EX294 Transform data with filters and plugins Practice Question
This EX294 practice question tests your understanding of transform data with filters and plugins. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A playbook uses `{{ my_var | default('fallback') }}`. What is the effect?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
If `my_var` is undefined, the expression evaluates to 'fallback'.
Option D is correct because the `default` filter in Ansible (also known as `d()`) returns the specified fallback value only when the variable is undefined. If `my_var` is defined but empty or None, the filter returns the variable's value (empty string or None), not the fallback. This behavior is specific to the `default` filter's default mode; to also catch empty or None values, you must use `default('fallback', true)`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
If `my_var` is defined but empty, the expression evaluates to 'fallback'.
Why it's wrong here
Incorrect; default only triggers on undefined, not on empty or falsy values.
✗
If `my_var` is defined but equal to None, the expression evaluates to 'fallback'.
Why it's wrong here
Incorrect; default does not treat None specially; it only checks if the variable is defined.
✗
The filter raises an error because 'default' is not a valid filter.
Why it's wrong here
Incorrect; 'default' is a valid Jinja2 filter.
✓
If `my_var` is undefined, the expression evaluates to 'fallback'.
Why this is correct
Correct; default filter provides a fallback for undefined variables.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'undefined' with 'falsy' (empty, None, 0), assuming the default filter replaces all falsy values, but Ansible's default filter only triggers on undefined variables unless the `true` parameter is explicitly added.
Detailed technical explanation
How to think about this question
The `default` filter in Ansible is a wrapper around Jinja2's `default` filter, which checks for variable existence using the `defined` test. By default, it only triggers on undefined variables, not on variables with falsy values like empty strings, 0, or None. To override this, you pass a second argument `true` (e.g., `{{ my_var | default('fallback', true) }}`), which uses the `boolean` parameter to treat falsy values as undefined. This distinction is critical when handling user input or configuration defaults where an empty string should be replaced.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the EX294 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Transform data with filters and plugins — This question tests Transform data with filters and plugins — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: If `my_var` is undefined, the expression evaluates to 'fallback'. — Option D is correct because the `default` filter in Ansible (also known as `d()`) returns the specified fallback value only when the variable is undefined. If `my_var` is defined but empty or None, the filter returns the variable's value (empty string or None), not the fallback. This behavior is specific to the `default` filter's default mode; to also catch empty or None values, you must use `default('fallback', true)`.
What should I do if I get this EX294 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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