Online Tool Store
Array Method Chain Visualizer
Enter an array and a chain of methods like filter, map, and reduce to see the array's state after each step in the chain. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Array Method Chain Visualizer
Sample: filter → map → reduce
Example shown — replace it with your own array and chain.
[1,2,3,4,5,6] .filter(n => n % 2 === 0) .map(n => n * 10) .reduce((a,b) => a + b, 0)
Result
filter → [2, 4, 6]
map → [20, 40, 60]
reduce → 120
How it works
- Enter your starting array and method chain.
- Each method in the chain is applied step by step.
- See the array's state after every step.
The method
Each chained method is applied in sequence to the array, with the intermediate result shown after every step, making it easy to see exactly where a value came from.
FAQ
Which array methods does this support?
Common chainable methods like filter, map, reduce, sort, and slice — the ones most often combined in a single chain.
Why show the array after each step?
Seeing the intermediate array after each method call makes it clear exactly what each step changed, which is often the hardest part of reading a long chain at a glance.
Does this execute my actual code?
No — this visualizes the transformation pattern step by step; run your real code in your own environment to confirm actual behavior.
How we compare
| Feature | Online Tool Store | console.log at each step | Reading the chain mentally |
|---|---|---|---|
| No software install | Yes | No | Yes |
| Quick to start | Yes | Setup required | Fast but error-prone |
| Free to use | Yes | Free | Free |
For understanding a long chain without adding temporary console.log statements, this gives you the same visibility faster.