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13. Union Type Control Flow
Mike discusses how union types are commonly used in programs to represent different possibilities based on control flow. The concept of discriminated unions, where a literal type is used as a discriminator to determine the type of the larger value is also introduced in this segment.
#lesson
Mike discusses how union types are commonly used in programs to represent different possibilities based on control flow. The concept of discriminated unions, where a literal type is used as a discriminator to determine the type of the larger value is also introduced in this segment.
#lesson
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14. Intersection Types
Mike discusses intersection types and how they are different from union types. Intersection types are very picky in terms of what values they accept, but they can be used in various contexts where the behavior of both types is required.
#lesson
Mike discusses intersection types and how they are different from union types. Intersection types are very picky in terms of what values they accept, but they can be used in various contexts where the behavior of both types is required.
#lesson
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15. Type Alias
Mike explains the concept of interfaces and type aliases in TypeScript. How type aliases can be used to give names to types and simplify complex type definitions, how type aliases can be used in place of literal types, and how they can be extended using intersection types are also demonstrated in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/07-interfaces-and-type-aliases/
#lesson
Mike explains the concept of interfaces and type aliases in TypeScript. How type aliases can be used to give names to types and simplify complex type definitions, how type aliases can be used in place of literal types, and how they can be extended using intersection types are also demonstrated in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/07-interfaces-and-type-aliases/
#lesson
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16. Interface extends & implements
Mike discusses how interfaces can be used to give a type a name and how they can be used for inheritance. The extends and implements keywords, as well as the differences between interfaces and type aliases are also covered in this segment.
#lesson
Mike discusses how interfaces can be used to give a type a name and how they can be used for inheritance. The extends and implements keywords, as well as the differences between interfaces and type aliases are also covered in this segment.
#lesson
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17. Open Interfaces
Mike discusses re-declaring and combining interfaces, allowing for the augmentation of existing types, and the limitations of type aliases in this context. Questions from the audience regarding the implementation of interfaces and the impact of modifying interfaces on other files are also covered in this segment.
#lesson
Mike discusses re-declaring and combining interfaces, allowing for the augmentation of existing types, and the limitations of type aliases in this context. Questions from the audience regarding the implementation of interfaces and the impact of modifying interfaces on other files are also covered in this segment.
#lesson
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18. Recursive Types
Mike explains the concept of recursive types using an example of nested numbers in an array. Defining a recursive type using type aliases in TypeScript and how it allows for infinitely nested arrays of numbers is also demonstrated in this segment.
#lesson
Mike explains the concept of recursive types using an example of nested numbers in an array. Defining a recursive type using type aliases in TypeScript and how it allows for infinitely nested arrays of numbers is also demonstrated in this segment.
#lesson
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19. JSON Type Exercise
Mike provides an exercise where the goal is to define a type that accepts any valid JSON value. The solution, explaining the different types and their relationships and demonstrating how to pass all the test cases is also provided.
- https://www.typescript-training.com/course/fundamentals-v4/08-exercise-json-types/
#lesson
Mike provides an exercise where the goal is to define a type that accepts any valid JSON value. The solution, explaining the different types and their relationships and demonstrating how to pass all the test cases is also provided.
- https://www.typescript-training.com/course/fundamentals-v4/08-exercise-json-types/
#lesson
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20. Type Queries
Mike discusses the different kinds of type queries, including key of, type of, and indexed access types. Examples and explanations of each type query and demonstrations of how they can be used to extract types from values and objects are also provided in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/09-type-queries/
#lesson
Mike discusses the different kinds of type queries, including key of, type of, and indexed access types. Examples and explanations of each type query and demonstrations of how they can be used to extract types from values and objects are also provided in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/09-type-queries/
#lesson
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21. Type Registry Pattern
Mike introduces the concept of the type registry pattern and explains how to use module declarations and open interfaces to create a central interface that represents a registry for different types of records. A demonstration of how this pattern can be used to easily add new types of records and achieve type checking in a web application's data layer is also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/09-type-queries/#use-case-the-type-registry-pattern
#lesson
Mike introduces the concept of the type registry pattern and explains how to use module declarations and open interfaces to create a central interface that represents a registry for different types of records. A demonstration of how this pattern can be used to easily add new types of records and achieve type checking in a web application's data layer is also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/09-type-queries/#use-case-the-type-registry-pattern
#lesson
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22. Callables
Mike discusses creating callable types, explains how to define a function type using an interface or a type alias, and how to specify the parameters and return type of the function. The instructor also discusses the difference between interfaces and type aliases, and when to use each one.
#lesson
Mike discusses creating callable types, explains how to define a function type using an interface or a type alias, and how to specify the parameters and return type of the function. The instructor also discusses the difference between interfaces and type aliases, and when to use each one.
#lesson
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23. void Type
Mike explains how "void" is used to indicate that a function does not have a return value or that the return value should be ignored. The difference between "void" and "undefined" and examples to illustrate the usefulness of "void" in certain scenarios are also covered in this segment.
#lesson
Mike explains how "void" is used to indicate that a function does not have a return value or that the return value should be ignored. The difference between "void" and "undefined" and examples to illustrate the usefulness of "void" in certain scenarios are also covered in this segment.
#lesson
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24. Constructables & Function Overloads
Mike discusses constructables and explains how to create a construct signature by adding the "new" keyword in front of a call signature. The concept of function overloads and a demonstration of how they can be used to handle different types of event handlers in a centralized event listener is also covered in this segment.
#lesson
Mike discusses constructables and explains how to create a construct signature by adding the "new" keyword in front of a call signature. The concept of function overloads and a demonstration of how they can be used to handle different types of event handlers in a centralized event listener is also covered in this segment.
#lesson
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25. this Types
Mike discusses how "this" refers to the context in which a function is called, such as the DOM element that fired an event. Explicitly providing a specific "this" type to a function using the bind method, and how to invoke the function with the correct "this" context is also covered in this segment.
#lesson
Mike discusses how "this" refers to the context in which a function is called, such as the DOM element that fired an event. Explicitly providing a specific "this" type to a function using the bind method, and how to invoke the function with the correct "this" context is also covered in this segment.
#lesson
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26. Explicit Function Return Types
Mike discusses best practices for functions in TypeScript. Without an explicit return type, errors may pop up in unexpected places, making it difficult to track down and fix the issue. The value of explicit return types, even if it may require extra typing is also discussed in this segment.
#lesson
Mike discusses best practices for functions in TypeScript. Without an explicit return type, errors may pop up in unexpected places, making it difficult to track down and fix the issue. The value of explicit return types, even if it may require extra typing is also discussed in this segment.
#lesson
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27. Class Fields & Methods
Mike explains how classes are used in JavaScript and how TypeScript adds additional features and syntax to define class fields, methods, and static fields. A demonstration of the use of static blocks, a recent addition to TypeScript and JavaScript, for class-level setup is also provided in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/11-classes/
#lesson
Mike explains how classes are used in JavaScript and how TypeScript adds additional features and syntax to define class fields, methods, and static fields. A demonstration of the use of static blocks, a recent addition to TypeScript and JavaScript, for class-level setup is also provided in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/11-classes/
#lesson
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28. Access Modifiers
Mike demonstrates how to use access modifier keywords like private and protected in TypeScript to control the visibility and accessibility of class properties and methods. The difference between private and protected, and how to define private and protected fields and methods in a class are also covered in this segment.
#lesson
Mike demonstrates how to use access modifier keywords like private and protected in TypeScript to control the visibility and accessibility of class properties and methods. The difference between private and protected, and how to define private and protected fields and methods in a class are also covered in this segment.
#lesson
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29. Param Properties & Overrides
Mike explains that param properties allow for the creation of class fields and constructor parameters with the same names, reducing the noise in class definitions. The use of the "override" keyword in TypeScript to indicate that a method in a subclass is intended to override a method in the base class, helping with refactoring and catching misspellings, is also discussed.
#lesson
Mike explains that param properties allow for the creation of class fields and constructor parameters with the same names, reducing the noise in class definitions. The use of the "override" keyword in TypeScript to indicate that a method in a subclass is intended to override a method in the base class, helping with refactoring and catching misspellings, is also discussed.
#lesson
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30. Type Guards
Mike discusses type guards, which are code snippets that allow the type system to make inferences about the type of a value at runtime. Examples of built-in type guards such as `instanceof`, `typeof`, and truthy-falsey checks, as well as how to define user-defined type guards are also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/12-type-guards/
#lesson
Mike discusses type guards, which are code snippets that allow the type system to make inferences about the type of a value at runtime. Examples of built-in type guards such as `instanceof`, `typeof`, and truthy-falsey checks, as well as how to define user-defined type guards are also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/12-type-guards/
#lesson
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31. When to Use Generics
Mike introduces generics that allow for parameterizing types and creating more reusable types and provides an example of creating a dictionary from an array of objects. Solving this problem using generics, and how to define a type parameter and use it to create a more flexible and type-safe solution are also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/13-generics/
#lesson
Mike introduces generics that allow for parameterizing types and creating more reusable types and provides an example of creating a dictionary from an array of objects. Solving this problem using generics, and how to define a type parameter and use it to create a more flexible and type-safe solution are also covered in this segment.
- https://www.typescript-training.com/course/fundamentals-v4/13-generics/
#lesson
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32. Generics Best Practices
Mike gives advice on best practices for using type parameters in TypeScript functions. An example of a function with two generic types and a demonstration of how inference works for both type parameters are also provided this segment.
#lesson
Mike gives advice on best practices for using type parameters in TypeScript functions. An example of a function with two generic types and a demonstration of how inference works for both type parameters are also provided this segment.
#lesson
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33. Dictionary Exercise
Mike provides a challenge for students to write functions that mimic the behavior of map, filter, and reduce functions but for dictionaries instead of lists. Sample data and an interface for a dictionary are provided, and the goal is to write these functions so that they pass a test suite.
- https://www.typescript-training.com/course/fundamentals-v4/14-dict-map-filter-reduce/
#lesson
Mike provides a challenge for students to write functions that mimic the behavior of map, filter, and reduce functions but for dictionaries instead of lists. Sample data and an interface for a dictionary are provided, and the goal is to write these functions so that they pass a test suite.
- https://www.typescript-training.com/course/fundamentals-v4/14-dict-map-filter-reduce/
#lesson