[英]How can I implement this logic
我有如下的對象結構
var obj = {
a : 1,
b : [x,y,z],
c : [0,1,3],
d : ['%','-','+']
}
我想將該對象轉換為以下格式
{
1 : {
x : {
0 : ['%','-','+'], // Last index remains as an array
1 : ['%','-','+'],
3 : ['%','-','+']
},
y : {
0 : ['%','-','+'], // Last index remains as an array
1 : ['%','-','+'],
3 : ['%','-','+']
},
z : {
0 : ['%','-','+'], // Last index remains as an array
1 : ['%','-','+'],
3 : ['%','-','+']
}
}
}
如果在上述情況下['%','-','+']
之后還有一個屬性,則相同的過程繼續..
var v = {}/* Object of above */, keys = Object.keys(v), simplifiedColumns = {};
for (var i = 0, l = keys.length; i < l ; i++) {
if (v[i] instanceof Array) {
}else{
simplifiedColumns[keys[i]] = simplifiedColumns[keys[i]] || {};
}
}
請建議我完成這個邏輯。
這是一個有效的算法,但它只會為x
, y
和z
創建一個對象,並引用同一個對象。
此外,以下示例假定鍵的順序(由Object.keys()
)與定義對象的順序相同。 情況並非總是如此,因此更好的解決方案是將對象更改為數組:
var obj = [
{
"key": "a",
"value": 1
},
{
"key": "b",
"value": ["x","y","z"]
},
{
"key": "c",
"value": [0,1,3]
},
{
"key": "d",
"value": ['%','-','+']
}
];
但無論如何,這里是使用原始對象表示法的算法:
var obj = {
a : 1,
b : ["x","y","z"],
c : [0,1,3],
d : ['%','-','+']
};
var keys = Object.keys(obj);
//set tempObj to the last array
var tempObj = obj[keys[keys.length - 1]];
//traverse the rest of the keys backwards
for (var i = keys.length - 2; i >= 0; i--) {
var key = keys[i];
//create new empty object
var newObj = {};
//append "tempObj" to that object and using the keys that are in the current array
//or if the property isn't an array, use the property itself as key
if (Array.isArray(obj[key])) {
for (var k = 0; k < obj[key].length; k++) {
newObj[obj[key][k]] = tempObj;
}
} else {
newObj[obj[key]] = tempObj;
}
//override tempObj with the new created object
tempObj = newObj;
}
順便說一句,如果您需要單獨的獨立對象,您可以更改該行
newObj[obj[key]] = tempObj;
喜歡的東西
newObj[obj[key]] = copyObject(tempObj);
其中copyObject
是一個創建對象深層副本的函數。 但我想在這種情況下,由於你一遍又一遍地復制相同的對象,性能將急劇下降。
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