Mulesoft Dataweave 减少

编程问答 2022-06-02

问题描述

我尝试了解 Mulesoft Dataweave 2.0 中的 reduce 函数。

预期结果：

{
  "dev": "1","test": "2","uat": "3","prod": "4"
}

我的数据编织代码：

%dw 2.0
var invar = [
  {"id": "1","name": "dev"},{"id": "2","name": "test"},{"id": "3","name": "uat"},{"id": "4","name": "prod"}
]
output application/json
---
// invar reduce() ???  requirment: it must be done with reduce function.

谢谢

解决方法

诀窍是在 DataWeave 无法自动推导时将累加器设置为正确的值：

%dw 2.0
var invar = [
  {"id": "1","name": "dev"},{"id": "2","name": "test"},{"id": "3","name": "uat"},{"id": "4","name": "prod"}
]
output application/json
---
invar reduce ((item,accumulator= {}) -> accumulator ++ {(item.name):item.id})
dataweavemulemulemule4