在这个例子中,flatMap 将每个数字映射到一个包含原始数字和它的两倍的新数组,并将所有这些数组“拍平”成一个单独的数组。如果你在使用这个代码时遇到 “flatmap is not a function” 的错误,可能是因为你的JavaScript环境不支持 flatMap,或者你没有正确地引入支持 flatMap 的库。
在java中，接收的参数是FlatMapFunction,我们需要自己定义FlatMapFunction的第二个泛型类型，即，代表了返...
publicfinal <R>Stream<R>flatMap(Function<?superP_OUT, ?extendsStream<?extendsR>> mapper) { Objects.requireNonNull(mapper); // We can do better than this, by polling cancellationRequested when stream is infinite returnnewStatelessOp<P_OUT, R>(this,StreamShape.REFERENCE, StreamOpFlag.NOT_SORT...
毫无根据的谣言，无理的指责，甚至是恶意的中伤和攻击。
Notice the mapper function isn’t executed when themapmethod is called. Instead,it runs at the time we subscribe to the stream. 4. TheflatMapOperator It’s time to move on to theflatMapoperator. 4.1. Code Example Similar tomap, theflatMapoperator has a single parameter of typeFunction. ...
.flatMap({ [weakself] output ->AnyPublisher<Data,Error>in// imagine that processOutput is a function that returns AnyPublisher<Data, ProcessingError>returnself?.processOutput(output) .mapError({$0asError}) .eraseToAnyPublisher() }) Having to line up errors manually for your calls toflatMapcan...
问flatMap不适用于纱线测试javascriptEN在大部份情况下我们都可以使用 PCA 进行线性降维。从图像处理到非...
In the second example, a Stream of List is passed.在第二个示例中,将传递列表流。It is NOT a Stream of Integer!它不是整数流! If a transformation Function has to be used (through map), then first the Stream has to be flattened to something else (a Stream of Integer).如果必须使用转换函...
var _ = require('lodash'); values = _.flatMap(products, function(p){ return _.map(p.components,'id') }) Output C:\Users\nzokd\Documents\Heroku\three21\server\managers\purchase-manager.js:76 values = _.flatMap(products, function(p){ ^ TypeError: _.flatMap is not a function at Qu...
Theiteratorfunction can return either a value (in that case it is simply appended to results) or an array (in that case the array is concatenated with results). Returningnullorundefinedfromiteratorwill append nothing to the results. Heads up!This is not equivalent to_.compose(_.flatten, _....