Which keyword is used to declare a variable in Dart whose value cannot be changed at runtime and must be known at compile-time?, var, late, const, final, Consider Dart's sound null safety system. What is the correct way to declare a String variable name that can optionally hold a null value?, Nullable name;, String name = null;, String name?;, String? name;, What will be the output of the following Dart code snippet? void main() { var list1 = [1, 2, 3]; var list2 = [0, ...list1, 4]; print(list2); }, [0, 1, 2, 3, 4], [0, [1, 2, 3], 4], Compilation Error, [1, 2, 3, 0, 4], What is the main difference between final and const in Dart?, final is used only inside class definitions, while const is global., const is evaluated at compile-time, whereas final is evaluated at runtime., final variables can be reassigned, while const variables cannot., There is no functional difference between them., How do you perform string interpolation in Dart for an expression like adding two variables a and b?, "The sum is " + a + b, "The sum is ${a + b}", "The sum is $a + b", "The sum is #(a + b)", How do you define optional named parameters in a Dart function signature?, Enclose the parameters in curly braces {}., Prefix the parameters with the optional keyword., Append a question mark ? after the function name., Enclose the parameters in square brackets []., What does the shorthand syntax => (arrow syntax) represent in Dart?, An inheritance relationship between classes., An asynchronous await call., A pointer to a variable memory location., A concise syntax for a function containing a single expression., What is the result of executing the following anonymous function snippet? void main() { var numbers = [1, 2, 3, 4]; var squared = numbers.map((n) => n * n).toList(); print(squared); }, [1, 2, 3, 4], (1, 4, 9, 16), [1, 4, 9, 16], 10, Which operator is used to call a function or access a property on an object only if that object is non-null?, ?., ??, as, !, In the context of Dart closures, what is captured by a closure function?, Only parameters explicitly passed into the closure., Only global scope variables., Primitive data types exclusively., Variables defined in its enclosing lexical scope, even after the outer function finishes execution., Which constructor type in Dart allows creating an instance of a class without always instantiating a new object (e.g., returning a cached instance or a subtype)?, Const constructor, Factory constructor, Generative constructor, Named constructor, In Dart, how does a class implement multiple interfaces when single inheritance is enforced?, By chaining with keywords for every interface., Dart does not support implementing multiple interfaces., By using the implements keyword followed by a comma-separated list., By using the extends keyword followed by a comma-separated list., What is the purpose of a mixin in Dart?, To enable primitive type casting., To define global top-level functions., To handle asynchronous data streams., To reuse a class's code in multiple class hierarchies without single inheritance restrictions., Given the following code snippet, what keyword belongs in the blank to extend class functionality without subclassing? ______ StringUtils on String { bool get isCapitalized => this.isNotEmpty && this[0] == this[0].toUpperCase(); }, abstract, typedef, extension, mixin, What is the behavior of an abstract class in Dart?, It must always be declared as a mixin., It serves as an architectural blueprint and cannot be directly instantiated., It can be directly instantiated using the standard new constructor., It cannot contain concrete method implementations.

Dart Programming Study Guide Quiz

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