[英]Array filtering in nested object using ramda
Let's assume that we have the following object:假设我们有以下 object:
const sample = {
foo: {
tags: [
'aaa', 'bbb'
],
a: 1,
b: 10
},
bar: {
tags: [
'ccc', 'ddd'
],
a: 11,
b: 100
}
}
How can one remove a specific tag value from object sample
using ramda?如何使用 ramda 从 object
sample
中删除特定标签值? I have done this我已经这样做了
/// Remove tag named 'aaa'
R.map(v => R.assoc('tags', R.without('aaa', v.tags), v), sample)
which achieves the desired result but how can I eliminate the lamda (and the closure created) inside map?这达到了预期的结果,但我怎样才能消除 map 内的 lamda (和创建的闭包)?
You could use evolve
instead of assoc
.您可以使用
evolve
而不是assoc
。 assoc
expects a property and plain value to set on provided object, whereas evolves
expects a property and function producing the new value (although in a slightly other syntax). assoc
期望在提供的 object 上设置一个属性和普通值,而 Evolutions 期望一个属性和evolves
产生新值(尽管语法稍有不同)。
R.map(R.evolve({tags: R.without('aaa')}), sample)
You can R.evolve each object, and use R.without to transform the value of tags
:您可以R.evolve每个 object,并使用 R.without 来转换
tags
的值:
const { map, evolve, without } = R const fn = map(evolve({ tags: without('aaa') })) const sample = {"foo":{"tags":["aaa","bbb"],"a":1,"b":10},"bar":{"tags":["ccc","ddd"],"a":11,"b":100}} const result = fn(sample) console.log(result)
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.27.0/ramda.js"></script>
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