[英]How do I iterate over this json structure to produce another structure?
I have this json structure.我有这个 json 结构。
x=[{
"value": 1.37,
"date_transacted": "2015-01-01"
}]
From this json structure, I want to produce the following json structure;从这个 json 结构中,我想生成以下 json 结构;
y1=[{
c: [{
v: "2015-01-01"
},
{
v: "1.37"
}]
}]
I have written the code to do this.我已经编写了代码来做到这一点。 It looks like this;它看起来像这样;
var y1 = [{ c:[ {"v":x[0].value}, {"v":x[0].date_transacted} ] }];
My problem comes when x
has several json key/value pairs.当x
有几个 json 键/值对时,我的问题就出现了。 Something that look like this;看起来像这样的东西;
x=[{
"value": 1.37,
"date_transacted": "2015-01-01"
},
{
"value": 1.62,
"date_transacted": "2015-02-01"
},
{
"value": 1.83,
"date_transacted": "2015-03-01"
}]
What is an effective way to iterate my code through the array of objects to produce the desired json structure which should look like this?通过对象数组迭代我的代码以生成应如下所示的所需 json 结构的有效方法是什么?
y=[{
c: [{
v: "2015-01-01"
},
{
v: "1.37"
}]
},
{
c: [{
v: "2015-01-02"
},
{
v: "1.62"
}]
},
{
c: [{
v: "2015-01-03"
},
{
v: "1.83"
}]
}]
The other answers here (except @user2415266) are not dynamic, hard-coded to accept an exact input, and are not particularly reusable.此处的其他答案(@user2415266 除外)不是动态的、硬编码的以接受确切的输入,并且不是特别可重用。 They will fail if you have more than 2 properties, or in @Siguza's case, also if you have properties not called 'date_transacted' and 'value'.如果您有 2 个以上的属性,或者在@Siguza 的情况下,如果您有未称为“date_transacted”和“value”的属性,它们将失败。
function restructureJson(obj) {
var output = {c:[]};
for (var i in obj) {
output.c.push({v:obj[i]});
}
return output;
}
This function is reusable on any array of objects, of any size, containing any number of properties.此函数可在任何大小、包含任意数量属性的任何对象数组上重用。
// Simple example
var json1 = [{
"value": 1.37,
"date_transacted": "2015-01-01"
}];
// More complex
var json2 = [{
"value": 1.37,
"date_transacted": "2015-01-01",
"another_value": "test",
"more": "12356"
},
{
"value": 1.62
},
{
"value": 1.83,
"date_transacted": "2015-03-01",
"stuff": "124334654567"
}];
// Map the function to the arrays
a = json1.map(restructureJson);
b = json2.map(restructureJson);
var y1=[];
for(var i=0;i<x.length;i++){
y1[i]= [{ c:[ {"v":x[i].value}, {"v":x[i].date_transacted} ] }];
}
As a single statement:作为一个单一的声明:
y = x.map(function(e)
{
return {
c:
[
{
v: e.value
},
{
v: e.date_transacted
}
]
};
});
Both other answers only work if the objects in x have the exact 2 properties.其他两个答案仅在 x 中的对象具有精确的 2 个属性时才有效。 A way to do it regardless of the amount of properties:无论属性数量如何,都可以这样做:
y = [];
for(var i = 0, i < x.length; i++){
var obj = {c:[]};
for(var prop in x[i]){
obj.c.push({v:x[i][prop]})
}
y.push(obj);
}
Edit: with map编辑:带地图
y = x.map(function(e)
{
var obj = {c: []};
for(var prop in e){
obj.c.push({v:e[prop]})
}
return obj;
});
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