RxJS operators help you work with events, data streams, and async tasks. In this course, you learn what operators are and how to use them in real code. You also see clear examples that show when to pick each operator.
What Operators Do
Operators change, filter, or combine streams. You use them to shape data as it moves. This keeps your code clear and easy to trace.
Why They Matter
Operators help you avoid nested callbacks. They also keep async steps in one flow.
Main Types of Operators
Creation Operators
These start new streams. You use them to create values, events, or timers.
- of creates a stream from set values.
- from turns a promise, array, or iterable into a stream.
- interval emits values on a fixed schedule.
Transformation Operators
These change each value in a stream.
- map changes each value.
- mergeMap handles async work and flattens results.
- switchMap switches to a new stream and drops old ones.
Filtering Operators
These pick which values pass through.
- filter keeps values that match a rule.
- take stops after a set number of values.
- debounceTime waits before it sends a value.
Combination Operators
These join two or more streams.
- merge joins streams in any order.
- concat runs streams one after another.
- combineLatest pairs the newest values from each stream.
How to Practice
Start with small examples. Change one operator at a time and watch the output. This helps you see how each step shapes the data.
Use Visual Tools
You can use tools like marble diagrams. They show how values move over time. This makes stream behavior easier to follow.
What You Will Build
You work through real tasks you see in apps. These tasks include search boxes, live updates, and async calls. Each task shows which operator fits the job.
