Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

predicate in `filterWhere` and `findWhere` should take index as second parameter

See original GitHub issue

Using component.findWhere(predicateFn) would be really useful if the second parameter of predicateFn would be the index.

It is customary in all iterator functions in ES6. For example:

['hello','mr'].find( (_, ind) => ind === 1 ) // return the second element

So in Enzyme, taking all elements starting with the 3rd element from a list could work like this:

domElement.find('.list-item').filterWhere( (_, ind) => ind >= 2 )

Issue Analytics

State:
Created 6 years ago
Comments:9 (4 by maintainers)

Top GitHub Comments

1reaction

ljharbcommented, May 16, 2017

Yes, but in ES6, they’re iterating over a list. In enzyme, .findWhere is iterating over a tree - there isn’t a useful index.

For the use case you mentioned, you can use .slice(2).

0reactions

ljharbcommented, May 16, 2017

You’ll note that the index is provided in the language when iterating over arrays, but that the iterable protocol introduced in ES6 lacks any concept of “index” or “count”.

Top Results From Across the Web

Split a list on an index in Prolog

The second parameter (CompleteList) is the list that the predicate should split on a given index. Parameter 3 and 4 are output parameters...

find(selector) => ReactWrapper - Enzyme - GitHub Pages

Finds every node in the render tree of the current wrapper that matches the provided selector. Arguments. selector ( EnzymeSelector ): The selector...

enzyme/mount.md at master - api

filterWhere (predicate) => ReactWrapper. Remove nodes in the current wrapper that do not return true for the provided predicate function. .hostNodes() => ...

Queryable.Where Method (System.Linq)

Each element's index is used in the logic of the predicate function. ... For these parameters, you can pass in a lambda expression...

Working with Databases: Query Builder

You must use the array format when selecting a DB expression that contains commas ... $query->where('status=1'); // or use parameter binding to bind...