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[英]Is there a function to make an object given an array of keys and a default value in JavaScript
[英]How to get value of keys present in a Json given that the keys are given in an array in Javascript?
假設我有一個由 JSON 中存在的鍵組成的數組,
const keys = ['Person:name','Person:Address:zip']
假設 JSON 如下
let data = [
{"Person":[
{"name":"P1",
"Address":{
"zip":"01"}
},
{"name":"P2",
"Address":{
"zip":"02"}
}
]
},
{"Person":[
{"Personname":"P3",
"Address":{
"zip":"03"}
},
{"name":"P4",
"Address":{
"zipcode":"04"}
}
]
},
{"People":[
{"name":"P5",
"Address":{
"zip":"05"}
},
{"name":"P6",
"Address":{
"zip":"06"}
}
]
},
]
基於鍵數組,我將不得不遍歷數據字典以獲取其各自的值。 對於上面的例子,結果應該是這樣的
[{"name":'P1','zip':'P1'},{"name":'P2','zip':'P2'},{"name":Null,'zip':'P3'},{"name":'P4','zip':Null}]
我已經嘗試了各種方法,例如 Javascript 中的遞歸和嵌套循環,但無法獲得這些結果。 有人可以幫忙嗎?
我將重新使用我最近的答案。 當然,我最終重寫了。 無論如何,一個鍵路徑是可行的,但不清楚如何組合 2 個或更多。 這是 1 個關鍵路徑的解決方案。
const keys = ['Person:name', 'Person:Address:zip'] let data = [{ "Person": [{ "name": "P1", "Address": { "zip": "01" } }, { "name": "P2", "Address": { "zip": "02" } } ] }, { "Person": [{ "Personname": "P3", "Address": { "zip": "03" } }, { "name": "P4", "Address": { "zipcode": "04" } } ] }, { "People": [{ "name": "P5", "Address": { "zip": "05" } }, { "name": "P6", "Address": { "zip": "06" } } ] }, ] function get_by_path(arr, arr_path) { var pointer = arr; var key = arr_path.shift(); while (arr_path.length) { var step = []; pointer.forEach(function(item) { step.push(item? (item[key]? item[key]: {}): {}) }); pointer = step.flat(); key = arr_path.shift(); } var result = pointer.map(function(item) { var obj = {} obj[key] = item? (item[key]? item[key]: null): null return obj }) return result; } keys.forEach(function(key) { var path = key.split(':'); var arr = get_by_path(data, path) console.log (arr); })
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