react-optimized-filter

A simple React component used for array filtering in an optimized way.

NOTE: This component uses a for-loop for filtering rather than the native Array's filter function. This means that filtering will be more performant (see jsperf test for details).

Storybook

Changelog

In what way is this component "optimized"?

This component uses a for-loop for filtering rather than the native Array's filter function, which yields better performance.

Re-filters only occur if the given items have changed order or any of the items have been changed/removed/added since the previous render or if any of the predicate props have changed since the last render. A memoize once pattern is used to accomplish this (I.E. the previous result of filtering is cached and filtering only occurs again if the previously given props have changed, otherwise, the cached result is passed on to the render/children prop).

It is important to note that a hash of items and the predicate props is used to determined if a change has occurred. This is very useful because one does not need to ensure that the exact same objects are passed to OptimizedFilter with every re-render; instead, everything can be specified inline and you will still get all of the optimization benefits of OptimizedFilter. To illustrate, see the "Usage" section below. In the example given, only the first render of MyComponent will trigger filtering within OptimizedFilter, while all subsequent renders will not trigger re-filtering even though a new function is created and passed as the predicate prop with every render of MyComponent.

Install

$ npm i --save react-optimized-filter

Usage

import React from 'react';
import OptimizedFilter from '/react-optimized-filter';
 
export default function MyComponent(props) {
  return (
    {/* ... */}
 
      <OptimizedFilter
        items={props.items}
        predicate={(item, index, predicateArg) => {
          // Determine if item should be included in filtered list...
        }}
        predicateArg={props.predicateArg}
        render={(filteredItems) => (
          // Render filtered items...
        )} />
 
      {/* ...or... */}
 
      <OptimizedFilter items={props.items}
              predicate={(item, index, predicateArg) => {
                // Determine if item should be included in filtered list...
              }}
              predicateArg={props.predicateArg}>
        {(filteredItems) => (
          // Render filtered items...
        )}
      </Filter>
 
    {/* ... */}
  );
}
 
function _predicate

Props

• items ?Array

  Array of items to be filtered and passed to render prop.

• render(filteredItems) or children(filteredItems) !Function - REQUIRED

  Render function (or function as child) called after items filtering is complete.

• predicate(item, itemIndex[, predicateArg]) !Function - REQUIRED

  Function to be called for each item in items. Return true to include item in the resulting filtered items list. Return false to exclude item from the resulting filtered items list.

• predicateArg ?*

  Parameter to be passed as an extra argument in predicate function. This prop is not required and is provided solely for convenience.

• skip ?Boolean

  When true, skips filtering and the value of items prop will be passed to render, unsorted. This is useful in the case where sorting may only be conditionally needed.

License

ISC License (ISC)

Copyright (c) 2020, Brandon D. Sara (https://bsara.dev)

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.