https://github.com/stevemao/composition-trace

Impure trace function to see what's going on in a composition
https://github.com/stevemao/composition-trace

composition debug debugger debugging debugging-tool fp functional-programming

Last synced: about 1 month ago
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Impure trace function to see what's going on in a composition

• Host: GitHub
• URL: https://github.com/stevemao/composition-trace
• Owner: stevemao
• Created: 2017-05-11T04:04:54.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-05-27T04:21:52.000Z (over 7 years ago)
• Last Synced: 2024-10-19T20:00:08.397Z (2 months ago)
• Topics: composition, debug, debugger, debugging, debugging-tool, fp, functional-programming
• Language: JavaScript
• Homepage:
• Size: 11.7 KB
• Stars: 3
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# Problem

```js

var dasherize = compose(join('-'), toLower, split(' '), replace(/\s{2,}/ig, ' '));

dasherize('The world is a vampire');

// TypeError: Cannot read property 'apply' of undefined

```

What arguments is `toLower` called with?

What does `split(' ')` return?

# Let's `trace`

```js

const trace = require('composition-trace');

var dasherize = compose(join('-'), toLower, trace('after split'), split(' '), replace(/\s{2,}/ig, ' '));

// after split [ 'The', 'world', 'is', 'a', 'vampire' ]

dasherize('The world is a vampire');

```

For more details, please see https://drboolean.gitbooks.io/mostly-adequate-guide/content/ch5.html#debugging

# Alternatives

- [treis](https://github.com/raine/treis)

- [`tap`](http://ramdajs.com/docs/#tap)

- [`do`](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/do.md)

# Related

- [inspect-curry](https://github.com/stevemao/inspect-curry)

- [inspect-compose](https://github.com/stevemao/inspect-compose)