Question 1

How do I install pjs on my machine?

Accepted Answer

Install pjs globally using npm with 'npm install -g pipeable-js'. This requires Node.js to be pre-installed, so ensure your environment supports it.

Question 2

pjs vs awk: which is better for quick text filtering?

Accepted Answer

pjs is better if you're already comfortable with JavaScript and need complex transformations with libraries like lodash. Awk is faster and more universal for simple pattern matching and lightweight tasks.

Question 3

How to process real-time logs with tail -f using pjs?

Accepted Answer

Pipe the output from 'tail -f' directly into pjs, using the streaming API to filter or map lines on the fly. For example, 'tail -f logfile | pjs -f "includes('error')"'.

Question 4

Can pjs handle CSV files effectively?

Accepted Answer

Yes, pjs can process CSV files by splitting lines with map operations, but it lacks built-in CSV parsing. You'll need to manually handle delimiters and headers with JavaScript expressions.

Question 5

What's the difference between pjs and pythonpy?

Accepted Answer

pjs uses JavaScript with built-in lodash/Ramda and supports JSON output and streaming, while pythonpy uses Python and may have better library integration but limited streaming capabilities as noted in the README.

Question 6

How to output JSON with pjs for an API?

Accepted Answer

Use the -j or --json flag when running pjs, and ensure your map or reduce expressions return objects. For example, 'echo "data" | pjs -jm "{value: $}"' outputs formatted JSON.

Question 7

Does pjs support asynchronous functions or promises?

Accepted Answer

The README doesn't mention async support; pjs is designed for synchronous, line-by-line processing, so it likely doesn't handle asynchronous operations well, limiting use cases with async data sources.

pjs

What is pjs?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions