Twig 3 Certification Test 2

Instructions

This test consists of 45 new questions about Twig 3. It covers various topics and has a time limit of 60 minutes. Choose the best answer for each question.

Questions

Basic Concepts

1. What is the main purpose of Twig?

   • A) To manage databases
   • B) To create web applications
   • C) To serve as a template engine for PHP
   • D) To handle HTTP requests

2. Which of the following is a valid Twig syntax for a variable?

   • A) {{ variable }}
   • B) {% variable %}
   • C) << variable >>
   • D) [variable]

3. What is the purpose of the |escape filter?

   • A) To remove whitespace
   • B) To convert a string to lowercase
   • C) To escape HTML characters
   • D) To format a date

Filters

1. Which filter would you use to capitalize the first letter of a string?

   • A) capitalize
   • B) upper
   • C) title
   • D) first

2. What does the |length filter do?

   • A) Returns the length of a string
   • B) Returns the number of elements in an array
   • C) Both A and B
   • D) None of the above

3. Which of the following is a valid way to chain filters in Twig?

   • A) {{ variable|filter1|filter2 }}
   • B) {{ filter1(filter2(variable)) }}
   • C) {{ variable|filter1(filter2) }}
   • D) {{ filter1|filter2(variable) }}

Tests

1. Which test checks if a variable is empty?

   • A) empty
   • B) null
   • C) defined
   • D) exists

2. How do you combine tests in Twig?

   • A) Using and and or
   • B) Using && and ||
   • C) Using & and |
   • D) All of the above

Control Structures

1. What is the correct syntax for a while loop in Twig?

   • A) {% while condition %}
   • B) {% for condition %}
   • C) {% loop condition %}
   • D) Twig does not support while loops.

2. How do you create a nested loop in Twig?

   • A) {% for item in items %}{% for subitem in subitems %}{% endfor %}{% endfor %}
   • B) {% loop item in items %}{% loop subitem in subitems %}{% endloop %}{% endloop %}
   • C) {% each item in items %}{% each subitem in subitems %}{% endeach %}{% endeach %}
   • D) None of the above.

Variables and Expressions

1. What is the output of {{ variable is defined ? 'Yes' : 'No' }} if variable is not defined?

   • A) Yes
   • B) No
   • C) Error
   • D) null

2. How do you access a property of an object in Twig?

   • A) {{ object.property }}
   • B) {{ object->property }}
   • C) {{ object[property] }}
   • D) Both A and C

Functions

1. Which function is used to get the current date in Twig?

   • A) current_date()
   • B) date()
   • C) now()
   • D) today()

2. What is the purpose of the include function in Twig?

   • A) To include a file
   • B) To include a template
   • C) To include a variable
   • D) To include a string

Operators

1. What does the in operator do in Twig?

   • A) Checks if a value exists in an array
   • B) Checks if a variable is defined
   • C) Checks if a string contains a substring
   • D) None of the above

2. Which of the following is a valid operator for string comparison in Twig?

   • A) =
   • B) ==
   • C) ===
   • D) Both B and C

Template Re-use

1. What is the purpose of the block tag in Twig?

   • A) To define a variable
   • B) To create a reusable template section
   • C) To include a template
   • D) To extend a template

2. How do you include a template fragment in Twig?

   • A) {% include 'fragment.twig' %}
   • B) {% embed 'fragment.twig' %}
   • C) {% import 'fragment.twig' %}
   • D) {% extend 'fragment.twig' %}

Mixed Questions

1. What is the output of {{ 'Hello'|upper }}?

   • A) Hello
   • B) hello
   • C) HELLO
   • D) hElLo

2. How do you create a conditional statement that checks if a variable is not null?

   • A) {% if variable is not null %}
   • B) {% if variable != null %}
   • C) {% if variable is defined and variable is not null %}
   • D) All of the above

3. Which of the following is a valid way to define a macro in Twig?

   • A) {% macro name() %}
   • B) {% define macro name() %}
   • C) {% function name() %}
   • D) {% template name() %}

4. What does the |date filter do?

   • A) Formats a date string
   • B) Converts a string to a date
   • C) Returns the current date
   • D) None of the above

5. How do you create a loop that iterates over a range of numbers in Twig?

   • A) {% for i in 1..10 %}
   • B) {% for i from 1 to 10 %}
   • C) Both A and B
   • D) None of the above

6. What is the purpose of the |join filter in Twig?

   • A) To join two strings
   • B) To join an array into a string
   • C) To join two arrays
   • D) To join two hashes

7. What does the |slice filter do?

   • A) Extracts a substring
   • B) Returns a portion of an array
   • C) Both A and B
   • D) None of the above

Advanced Questions

1. How do you check if an array contains a specific value in Twig?

   • A) value in array
   • B) array.contains(value)
   • C) array.includes(value)
   • D) array.has(value)

2. What is the output of {{ [1, 2, 3]|length }}?

   • A) 3
   • B) 2
   • C) 1
   • D) Error

3. Which of the following is a valid way to create a nested block in Twig?

   • A) {% block outer %}{% block inner %}{% endblock %}{% endblock %}
   • B) {% block outer %}{% endblock inner %}
   • C) {% block outer %}{% block inner %}{% endblock inner %}{% endblock outer %}
   • D) {% block outer %}{% block inner %}{% endblock outer %}{% endblock inner %}

4. How do you create a custom filter in Twig?

   • A) {% filter name %}
   • B) {% define filter name %}
   • C) {% filter name(value) %}
   • D) {% filter(name) %}

5. What is the purpose of the |default filter?

   • A) To provide a default value if a variable is undefined
   • B) To format a date
   • C) To convert a string to lowercase
   • D) To escape HTML

6. What is the output of {{ 'Twig'|length }}?

   • A) 4
   • B) 3
   • C) 5
   • D) Error

7. How do you create a loop that iterates over a hash in Twig?

   • A) {% for key, value in hash %}
   • B) {% for value in hash %}
   • C) {% for key => value in hash %}
   • D) {% for item in hash %}

8. What does the |merge filter do?

   • A) Merges two arrays
   • B) Merges two hashes
   • C) Merges two strings
   • D) Both A and B

9. What is the purpose of the |reverse filter?

   • A) To reverse a string
   • B) To reverse an array
   • C) To reverse a hash
   • D) All of the above

10. How do you create a loop that iterates over a hash and preserves the keys?

    • A) {% for key, value in hash %}
    • B) {% for value in hash %}
    • C) {% for key => value in hash %}
    • D) {% for item, value in hash %}

11. What is the output of {{ 'Hello World'|slice(0, 5) }}?

    • A) Hello
    • B) Hello World
    • C) World
    • D) Error

12. How do you create a conditional statement that checks if a variable is an array?

    • A) {% if variable is iterable %}
    • B) {% if variable is array %}
    • C) {% if variable is defined and variable is not null %}
    • D) All of the above

13. What is the purpose of the |sort filter?

    • A) To sort an array in ascending order
    • B) To sort a hash by keys
    • C) To sort a hash by values
    • D) All of the above

14. How do you create a loop that iterates over an array in reverse order?

    • A) {% for item in array|reverse %}
    • B) {% for item in array %}{% endfor %}
    • C) {% for item in reverse(array) %}
    • D) {% for item in array|sort('desc') %}

15. What is the purpose of the |batch filter?

    • A) To batch an array into smaller arrays
    • B) To batch a hash into smaller hashes
    • C) To batch a string into smaller strings
    • D) To batch a number into smaller numbers

16. How do you create a loop that iterates over a hash and preserves the keys as variables?

    • A) {% for key, value in hash %}
    • B) {% for value in hash %}
    • C) {% for key => value in hash %}
    • D) {% for key, value in hash with keys %}

17. What is the output of {{ 10 % 3 }}?

    • A) 3
    • B) 1
    • C) 0
    • D) Error

18. What is the purpose of the |first filter?

    • A) To get the first element of an array
    • B) To get the first character of a string
    • C) To get the first key of a hash
    • D) All of the above

19. How do you create a loop that iterates over an array and skips every second element?

    • A) {% for item in array|slice(2) %}
    • B) {% for item in array|batch(2) %}
    • C) {% for item in array|slice(0, 2) %}
    • D) {% for item in array|slice(1, 2) %}

20. What does the |join filter do?

    • A) Joins two strings
    • B) Joins an array into a string
    • C) Joins two arrays
    • D) Joins two hashes

Answers

Basic Concepts

1. C) To serve as a template engine for PHP
2. A) {{ variable }}
3. C) To escape HTML characters

Filters

1. A) capitalize
2. C) Both A and B
3. A) {{ variable|filter1|filter2 }}

Tests

1. A) empty
2. A) Using and and or

Control Structures

1. D) Twig does not support while loops.
2. A) {% for item in items %}{% for subitem in subitems %}{% endfor %}{% endfor %}

Variables and Expressions

1. B) No
2. A) {{ object.property }}

Functions

1. C) now()
2. B) To include a template

Operators

1. A) Checks if a value exists in an array
2. D) Both B and C

Template Re-use

1. B) To create a reusable template section
2. A) {% include 'fragment.twig' %}

Mixed Questions

1. C) HELLO
2. D) All of the above
3. A) {% macro name() %}
4. A) Formats a date string
5. C) Both A and B
6. B) To join an array into a string
7. C) Both A and B

Advanced Questions

1. A) value in array
2. A) 3
3. A) {% block outer %}{% block inner %}{% endblock %}{% endblock %}
4. A) {% filter name %}
5. A) To provide a default value if a variable is undefined
6. A) 4
7. A) {% for key, value in hash %}
8. D) Both A and B
9. B) To reverse an array

10. A) {% for key, value in hash %}

11. A) Hello

12. A) {% if variable is iterable %}
13. D) All of the above
14. A) {% for item in array|reverse %}
15. A) To batch an array into smaller arrays
16. A) {% for key, value in hash %}
17. B) 1
18. A) To get the first element of an array
19. B) {% for item in array|batch(2) %}
20. B) Joins an array into a string

Feel free to review your answers and see how well you understand Twig 3!