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Question-1. What is Wren?
Answer-1: Wren is a small, fast, and embeddable scripting language designed for performance and ease of use.
Question-2. Who created Wren?
Answer-2: Wren was created by Bob Nystrom.
Question-3. What are the main features of Wren?
Answer-3: Wren features a small footprint, high performance, concurrency via fibers, and an easy-to-use class-based object model.
Question-4. What kind of programming paradigm does Wren follow?
Answer-4: Wren is an object-oriented language with some functional programming capabilities.
Question-5. How does Wren handle memory management?
Answer-5: Wren uses automatic garbage collection to manage memory.
Question-6. How do you declare a variable in Wren?
Answer-6: Using var, e.g., var x = 10;.
Question-7. How do you define a function in Wren?
Answer-7: Using fn, e.g., fn greet() { System.print("Hello!"); }.
Question-8. What is the entry point of a Wren script?
Answer-8: Wren does not have a strict entry point; execution starts from the first statement in the script.
Question-9. What is a fiber in Wren?
Answer-9: A fiber is Wren?s lightweight concurrency primitive, similar to coroutines.
Question-10. How do you create a fiber in Wren?
Answer-10: Using Fiber.new(fn), e.g., var f = Fiber.new(fn() { System.print("Hello"); });.
Question-11. How do you resume a fiber in Wren?
Answer-11: Using f.call(), where f is a fiber instance.
Question-12. How do you declare a class in Wren?
Answer-12: Using class, e.g., class Animal {}.
Question-13. How do you create an instance of a class in Wren?
Answer-13: Using new, e.g., var obj = Animal.new();.
Question-14. How do you define a constructor in Wren?
Answer-14: Using construct, e.g., construct new(name) { _name = name; }.
Question-15. How do you define a method inside a class in Wren?
Answer-15: By declaring it inside a class block, e.g., fn sayHello() { System.print("Hello!"); }.
Question-16. How do you access an instance variable in Wren?
Answer-16: Using _variableName, e.g., _name.
Question-17. How do you define a static method in Wren?
Answer-17: Using static, e.g., static fn greet() { System.print("Hello!"); }.
Question-18. What is the purpose of _ in Wren variable names?
Answer-18: Instance variables in Wren are prefixed with _ to indicate they are private to the instance.
Question-19. How does Wren handle string interpolation?
Answer-19: Using "${variable}", e.g., var name = "Wren"; System.print("Hello, ${name}");.
Question-20. How do you concatenate strings in Wren?
Answer-20: Using +, e.g., "Hello " + "World!".
Question-21. How do you check the length of a string in Wren?
Answer-21: Using .count, e.g., "hello".count.
Question-22. How do you iterate over a list in Wren?
Answer-22: Using a for loop, e.g., for (item in list) { System.print(item); }.
Question-23. How do you create a list in Wren?
Answer-23: Using square brackets, e.g., var numbers = [1, 2, 3];.
Question-24. How do you add an element to a list in Wren?
Answer-24: Using .add(), e.g., numbers.add(4);.
Question-25. How do you remove an element from a list in Wren?
Answer-25: Using .removeAt(index), e.g., numbers.removeAt(1);.
Question-26. How do you check if an item exists in a list in Wren?
Answer-26: Using .contains(), e.g., numbers.contains(2).
Question-27. How do you create a map (dictionary) in Wren?
Answer-27: Using {}, e.g., var map = {"key": "value"};.
Question-28. How do you access a value in a map in Wren?
Answer-28: Using map["key"], e.g., System.print(map["key"]);.
Question-29. How do you check if a key exists in a map in Wren?
Answer-29: Using .containsKey(), e.g., map.containsKey("key").
Question-30. How do you loop through a map in Wren?
Answer-30: Using for (key in map), e.g., for (key in map) { System.print(key, map[key]); }.
Question-31. What is the difference between == and is in Wren?
Answer-31: == checks value equality, while is checks object identity.
Question-32. How do you perform conditional statements in Wren?
Answer-32: Using if, else if, and else, e.g., if (x > 10) { System.print("Big"); }.
Question-33. How do you write a while loop in Wren?
Answer-33: Using while, e.g., while (x > 0) { x = x - 1; }.
Question-34. How do you write a for loop in Wren?
Answer-34: Using for, e.g., for (i in 1..5) { System.print(i); }.
Question-35. How do you exit a loop early in Wren?
Answer-35: Using break.
Question-36. How do you skip an iteration in Wren?
Answer-36: Using continue.
Question-37. How do you define a getter in Wren?
Answer-37: Using a method with the same name as the field, e.g., fn name { return _name; }.
Question-38. How do you define a setter in Wren?
Answer-38: Using a method with a = in its name, e.g., fn name=(value) { _name = value; }.
Question-39. How does Wren handle errors?
Answer-39: Using Fiber.abort("Error message").
Question-40. What happens if an error is not handled in Wren?
Answer-40: The script execution stops, and an error message is displayed.
Question-41. How do you import a module in Wren?
Answer-41: Using import "moduleName" for ClassName.
Question-42. How do you write a module in Wren?
Answer-42: By defining a script and exposing classes or functions from it.
Question-43. What file extension does Wren use?
Answer-43: .wren.
Question-44. How do you execute a Wren script?
Answer-44: Using a Wren interpreter like wren-cli or embedding it in an application.
Question-45. How do you run Wren inside C?
Answer-45: By embedding Wren into a C application using its API.
Question-46. What is wren-cli?
Answer-46: wren-cli is a command-line interpreter for running Wren scripts.
Question-47. How do you print to the console in Wren?
Answer-47: Using System.print("Hello, World!");.
Question-48. How do you format numbers in Wren?
Answer-48: Using "%d" % value, e.g., "%d" % 42.
Question-49. How do you create a range in Wren?
Answer-49: Using 1..5, which includes 1 to 5.
Question-50. Why use Wren over other scripting languages?
Answer-50: Wren is lightweight, fast, embeddable, and has a simple but powerful object model.
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