最终R.sum的ramda传感器

问题描述

我想了解Ramda的传感器。这是来自文档的稍微修改的示例：

const numbers = [1,2,3,4];
const isOdd = (x) => x % 2 === 1;
const firstFiveOddTransducer = R.compose(R.filter(isOdd),R.take(5));
R.transduce(firstFiveOddTransducer,R.flip(R.append),[],R.range(0,100)); //=> [ 1,5,7,9 ]

但是，如果我想对结果数组的元素求和怎么办？以下内容（仅将R.sum添加到R.compose中）无效：

const firstFiveOddTransducer = R.compose(R.filter(isOdd),R.take(5),R.sum);

解决方法

我会做这样的事情， 只是累积在初始0值之上

const list = [1,2,3,4,5];
const isOdd = R.filter(n => n % 2);

const transducer = R.compose(isOdd);

const result = R.transduce(transducer,R.add,list);

console.log(
  'result',result,);

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