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.
Exhibit
Refer to the exhibit.
```yaml
- hosts: localhost
tasks:
- debug:
msg: "{{ ['apple', 'banana'] | map('upper') | list | first }}"
```
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
'APPLE'
Option A is correct because the `map` filter in Ansible applies the `upper` filter to each element of the list `['apple', 'banana']`, converting both strings to uppercase. The `map` filter returns a generator, but when used in a `debug` task, Ansible automatically converts it to a list, producing `['APPLE', 'BANANA']`. However, the question's output is shown as `'APPLE'` (a single string), which is incorrect for the given list; the correct output should be `['APPLE', 'BANANA']`. Based on the answer options, A is marked as correct, but this is a misalignment—the actual output would be a list, not a single string. Assuming the question intended a single-element list or a different input, the `map` filter with `upper` on a list of strings yields a list of uppercased strings.
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.
✓
'APPLE'
Why this is correct
Correct; the filters produce 'APPLE'.
Related concept
Read the scenario before looking for a memorised answer.
✗
An error because map expects a list of strings.
Why it's wrong here
Incorrect; the input is a list of strings.
✗
['APPLE', 'BANANA']
Why it's wrong here
Incorrect; first filter returns a single element.
✗
'apple'
Why it's wrong here
Incorrect; map('upper') uppercases all.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think `map` returns a list directly, but it returns a generator, and they might also confuse the output format (single string vs. list) or incorrectly assume an error occurs when the input is not a list of strings.
Detailed technical explanation
How to think about this question
The `map` filter in Ansible is a Jinja2 extension that applies a specified filter to each item in a sequence, returning a generator. When used in a playbook, Ansible evaluates the generator and converts it to a list for display. The `upper` filter is a Jinja2 built-in that converts a string to uppercase. In real-world scenarios, `map` is often used with `regex_replace` or `quote` to transform lists of hostnames or IP addresses, and understanding its lazy evaluation is critical to avoid unexpected behavior when chaining filters.
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: 'APPLE' — Option A is correct because the `map` filter in Ansible applies the `upper` filter to each element of the list `['apple', 'banana']`, converting both strings to uppercase. The `map` filter returns a generator, but when used in a `debug` task, Ansible automatically converts it to a list, producing `['APPLE', 'BANANA']`. However, the question's output is shown as `'APPLE'` (a single string), which is incorrect for the given list; the correct output should be `['APPLE', 'BANANA']`. Based on the answer options, A is marked as correct, but this is a misalignment—the actual output would be a list, not a single string. Assuming the question intended a single-element list or a different input, the `map` filter with `upper` on a list of strings yields a list of uppercased strings.
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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