junaiddshaukat opened a new issue, #37407:
URL: https://github.com/apache/beam/issues/37407
### What would you like to happen?
## Summary
Add a `filter()` method to the `PCollection` class in the TypeScript SDK,
consistent with the existing `map()` and `flatMap()` methods.
## Motivation
The TypeScript SDK currently provides `map()` and `flatMap()` methods on
`PCollection`, but lacks a `filter()` method. This is explicitly mentioned as a
TODO in the README-dev.md:
> "Also add a [do]Filter, and possibly a [do]Reduce?"
The Python SDK already provides `beam.Filter()` for this purpose. Adding
`filter()` to the TypeScript SDK would:
1. **Improve developer experience** - JavaScript developers expect
`filter()` alongside `map()`
2. **Improve code readability** - `pcoll.filter(x => x > 0)` is cleaner than
`pcoll.flatMap(x => x > 0 ? [x] : [])`
3. **Maintain consistency** with the Python SDK which has `beam.Filter()`
## Proposed API
// Filter even numbers
const evens = pcoll.filter(x => x % 2 === 0);
// Filter with context (for side inputs, etc.)
const filtered = pcoll.filter((x, ctx) => x > ctx.threshold, { threshold:
sideInput });
### Issue Priority
Priority: 2 (default / most feature requests should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [x] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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