MuleSoft Dataweave 减少

Question

我尝试了解 Mulesoft Dataweave 2.0 中的归约函数。

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

Answer 1

技巧是当 DataWeave 无法自动推导累加器时将其设置为正确的值：

%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})