如何使用键数组从嵌套对象中获取值?
// my sample object
var obj = {
type : "Purchase",
category : "Apartment",
categoryOptions : {
apartment : {
floors : {
type : "number",
value : null,
placeholder : "Total Floors"
},
},
},
}
var keysArray = ["value", "floors", "apartment", "categoryOptions"]
我尝试使用 array.reduceRight实现这一目标但无法使其发挥作用。
这是我试过的:
var roadToValue = keysArray.reduceRight(
function(previousValue, currentValue){
return previousValue + "[" + currentValue + "]" ;
}
);
// above function results in a single string like
// "categoryOptions[apartment][floors][value]"
// which off-course can't be used as object key
// and obj[roadToValue] results in 'undefined'
有什么办法可以让我在这里获得传递给 obj 的正确 key 吗?
最佳答案
你绝对可以使用 reduceRight
为了这。问题是您创建了一个字符串,但是您需要将对象作为 initialValue
传递并使用方括号表示法:
var obj = {"type":"Purchase","category":"Apartment","categoryOptions":{"apartment":{"floors":{"type":"number","value":null,"placeholder":"Total Floors"}}}}
var keysArray = ["value", "floors", "apartment", "categoryOptions"]
var value = keysArray.reduceRight((r, e) => r[e] || r, obj)
console.log(value)
关于JavaScript - 使用键数组从嵌套对象中检索值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44590743/