updeep | Easily update nested frozen objects and arrays | Functional Programming library
kandi X-RAY | updeep Summary
kandi X-RAY | updeep Summary
updeep makes updating deeply nested objects/arrays painless by allowing you to declare the updates you would like to make and it will take care of the rest. It will recursively return the same instance if no changes have been made, making it ideal for using reference equality checks to detect changes (like PureRenderMixin). Because of this, everything returned by updeep is frozen. Not only that, but updeep assumes that every object passed in to update is immutable, so it may freeze objects passed in as well. Note that the freezing only happens in development. updeep requires lodash, but works very well with lodash-fp or Ramda. As a matter of fact, many of the helpers functions are curried lodash functions with their parameters reversed (like lodash-fp). Note that the parameters may be backwards from what you may be used to. updeep supports partial application, so the parameter order is: updeep(updates, object).
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Top functions reviewed by kandi - BETA
- Creates a new curry function .
- Produces a 3 3 arguments .
- recursively update an object
- Recursively resolve updates .
- Creates a benchmark object
- A specialized version of curry functions
- Deep freeze an object .
- Is the predicate?
- Test if an object are equal .
- Reduce path to wildcard
updeep Key Features
updeep Examples and Code Snippets
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QUESTION
I have a React / Redux app in which I draw a 2-dimensional grid. The grid data is in the Redux store, as an array of arrays. e.g. for a 3x2 grid it might be like this:
...ANSWER
Answered 2020-Jan-07 at 20:51I think you missunderstand the mapStateToProps function. It will be called for every redux state update and it has to figure out, if the values for that changed. So it has to call every mapStateToProps for each cell.
That does not mean, though, that it rerenders that component. If the previous and current return values of mapStateToProps are the same, the update will be aborted.
So it is correct that the mapStateToProps is called. Check if the cells are actually rerendered. You can also remove the getValueCached wrapper and access the grid directly with state.grid[identifiers[0]][identifiers[1]]
. This will be faster than the cached version since its just a direct access. And you do not get any benefit from the cached version, since its not a heavy computation.
It might even be faster to connect the highest component and jsut let it rerender if needed. Another option is to use react-window to only render the current visible grid items, which will greatly improve your performance.
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