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TypeScript Developer

Move beyond basics into practical typed programming with real-world data, reusable structures, object-oriented code, modules, APIs, and asynchronous workflows. Learn how to model complex values, organize larger programs, validate data, and write safer logic with narrowing, generics, utility types, and structured error handling. Certificate upon completion.

TypeScript Developer

Default Parameters

Provide typed fallback values for function arguments

Store ordered collections of typed indexed values

Store fixed-position values where each position has a known type

Define typed key-value structures for grouped data

Create reusable names for object shapes, unions, and complex types

Allow a value to safely be one of several possible types

Restrict values to exact allowed strings, numbers, or booleans

Extract typed values from arrays and objects

Spread and Rest Operators

Expand or collect typed values into arrays, objects, and parameters

Template Literals

Embed typed expressions inside string templates

Optional Chaining

Safely access nested properties using ?.

Nullish Coalescing

Provide defaults only when a value is null or undefined

Use built-in numeric operations and constants with typed number values

Work with typed date objects, timestamps, and calendar values

Store typed collections of unique values

Store typed key-value collections where keys can have non-string types

Basic Error Handling

Catch runtime exceptions and handle errors safely with unknown

Define reusable contracts for object shapes and class implementations

Interfaces vs Type Aliases

Choose between interfaces and type aliases based on modeling needs

Classes in TypeScript

Build typed class-based objects with constructors, properties, and access modifiers

Class Inheritance

Extend typed classes and share behavior through subclassing

Closures in TypeScript

Use functions that retain typed access to outer-scope variables

Function Callback Types

Describe callback parameters and return values safely

Async Programming - Callbacks

Type asynchronous callback arguments and completion handlers

Async Programming - Promises

Represent future typed values from asynchronous operations

Async Programming - async/await

Write asynchronous TypeScript with typed resolved values

JSON and Type Boundaries

Parse structured data while recognizing that external data needs validation

Array Iteration - map

Transform each typed array element into new typed values

Array Iteration - filter

Select typed elements matching a condition or type guard

Array Iteration - reduce

Combine typed array values into one accumulated result

Array Iteration - forEach

Execute typed side-effect logic for each array element

typeof Operator

Narrow runtime values and derive types from existing values