material-motion
Version:
Makes it easy to add rich, interactive motion to your application.
37 lines • 1.42 kB
JavaScript
/** @license
* Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
import { isDefined, } from '../../typeGuards';
export function withFilter(superclass) {
return class extends superclass {
/**
* Checks every incoming value with `predicate` and synchronously passes
* values that return `true` to the observer.
*
* If `predicate` is not supplied, `_filter` will pass through any value
* that is not `undefined`.
*/
_filter({ predicate = isDefined } = {}) {
return this._nextOperator({
operation: ({ emit }) => ({ upstream }) => {
if (predicate(upstream)) {
emit(upstream);
}
}
});
}
};
}
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