Twig 3 Certification Test 8

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 purpose of the |escape filter in Twig?

   • A) To remove all HTML tags from a string
   • B) To escape HTML characters
   • C) To output unescaped HTML
   • D) To convert a string to uppercase

2. How do you define a variable in Twig?

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

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

   • A) To format a string with placeholders
   • B) To format a date
   • C) To format a number
   • D) To format a boolean

Filters

1. Which filter would you use to format a number with thousands separators?

   • A) format_number
   • B) number_format
   • C) format_thousands
   • D) thousands_format

2. What does the |trim filter do?

   • A) Trims whitespace from the beginning and end of a string
   • B) Trims a specific character from a string
   • C) Trims a string to a specific length
   • D) None of the above

3. How do you apply multiple filters to a variable with alternative syntax?

   • A) {{ variable|filter1|filter2|filter3 }}
   • B) {{ filter1(filter2(filter3(variable))) }}
   • C) {{ variable|filter1(filter2(filter3)) }}
   • D) {{ variable|filter1(variable|filter2(variable|filter3)) }}

Tests

1. What test can be used to check if a variable is a number?

   • A) is_number
   • B) number
   • C) is iterable
   • D) is defined

2. How do you combine multiple tests in a single condition using the alternative syntax?

   • A) {{ variable is defined and variable is not null }}
   • B) {{ variable is defined or variable is not null }}
   • C) {{ variable is defined & variable is not null }}
   • D) {{ variable is defined | variable is not null }}

Control Structures

1. What is the correct syntax for a for loop that iterates over a hash in Twig?

   • A) {% for key, value in hash %}
   • B) {% loop key, value in hash %}
   • C) {% each key, value in hash %}
   • D) None of the above

2. How do you create an if-elseif-else statement in Twig?

   • A) {% if condition1 %}{% elseif condition2 %}{% else %}{% endif %}
   • B) {% if condition1 %}{% elif condition2 %}{% else %}{% endif %}
   • C) {% if condition1 %}{% elseif condition2 %}{% elseif condition3 %}{% else %}{% endif %}
   • D) All 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 nested array element in Twig?

   • A) {{ array[index1][index2] }}
   • B) {{ array->index1->index2 }}
   • C) {{ array.index1.index2 }}
   • D) Both A and C

Functions

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

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

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

   • A) To output a variable's value for debugging
   • B) To clear the output buffer
   • C) To format a string
   • D) To include a template

Operators

1. What does the is operator do in Twig?

   • A) Checks if a variable is defined
   • B) Checks if a variable is null
   • C) Both A and B
   • D) None of the above

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

   • A) >=
   • B) <=
   • C) <>
   • D) All of the above

Template Re-use

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

   • A) To include a template
   • B) To define a base template
   • C) To create a reusable template section
   • D) To define a macro

2. How do you embed a template in another template in Twig?

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

Mixed Questions

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

   • A) Hello World
   • B) HELLO WORLD
   • C) hello world
   • D) Error

2. How do you create a conditional statement that checks if a variable is an object using the is operator?

   • A) {% if variable is iterable %}
   • B) {% if variable is object %}
   • 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 using the in operator 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 using the alternative syntax?

   • A) {{ 'string'|myfilter }}
   • B) {{ myfilter('string') }}
   • C) {{ 'string'|myfilter('arg') }}
   • D) Both A and C

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 and preserves the keys using the keys keyword?

   • 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 %}

8. What does the |merge filter do with arrays?

   • A) Merges two arrays into a single array
   • B) Merges two hashes into a single hash
   • C) Merges two strings into a single string
   • D) None of the above

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 as variables using the keys keyword?

    • 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 %}

11. What is the output of {{ 'Hello World'|slice(6) }}?

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

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

    • 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 |batch filter?

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

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

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

15. What does the |abs filter do?

    • A) Returns the absolute value of a number
    • B) Formats a date
    • C) Formats a number
    • D) Formats a boolean

16. What is the output of {{ 10 / 3 }}?

    • A) 3
    • B) 3.33
    • C) 3.3333333333
    • D) Error

17. What is the purpose of the |last filter?

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

18. How do you create a loop that iterates over an array and skips every second element using the |batch filter with a step size?

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

19. What is the purpose of the |format filter with the '%d' format?

    • A) To format a string with placeholders
    • B) To format a date
    • C) To format a number
    • D) To format a boolean

20. What is the output of {{ 'twig'|capitalize }}?

    • A) Twig
    • B) TWIG
    • C) twig
    • D) Error

Answers

Basic Concepts

1. B) To escape HTML characters
2. A) {% set variable = value %}
3. A) To format a string with placeholders

Filters

1. B) number_format
2. A) Trims whitespace from the beginning and end of a string
3. D) {{ variable|filter1(variable|filter2(variable|filter3)) }}

Tests

1. A) is_number
2. A) {{ variable is defined and variable is not null }}

Control Structures

1. A) {% for key, value in hash %}
2. D) All of the above

Variables and Expressions

1. B) No
2. D) Both A and C

Functions

1. B) now()
2. A) To output a variable's value for debugging

Operators

1. C) Both A and B
2. D) All of the above

Template Re-use

1. C) To create a reusable template section
2. B) {% embed 'template.twig' %}

Mixed Questions

1. B) HELLO WORLD
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. D) Both A and C
5. A) To provide a default value if a variable is undefined
6. A) 4
7. D) {% for key, value in hash with keys %}
8. A) Merges two arrays into a single array
9. B) To reverse an array
10. A) {% for key, value in hash %}
11. B) World
12. D) All of the above
13. A) Batches an array into smaller arrays
14. A) {% for item in array|reverse %}
15. A) Returns the absolute value of a number
16. C) 3.3333333333
17. D) All of the above
18. B) {% for item in array|batch(2, true) %}
19. C) To format a number
20. A) Twig

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