[英]JavaScript - retrieve value from nested object, using array of keys
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实现此目的,但无法使其正常工作。
这是我尝试过的:
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获得正确的密钥以在此处传递给obj吗?
您绝对可以为此使用reduceRight
。 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)
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