[英]How to dynamically populate a multidimensional array in JavaScript?
I have an object that I get from a URL request:我有一个从 URL 请求中获得的 object:
var data = {
"DataSet": {
"Series": [
{
"@FREQ": "A",
"@REF_AREA": "BF",
"@INDICATOR": "NGDP_R_PC_PP_PT",
"@UNIT_MULT": "0",
"@TIME_FORMAT": "P1Y",
"Obs": [
{
"@TIME_PERIOD": "2018",
"@OBS_VALUE": "6"
},
{
"@TIME_PERIOD": "2019",
"@OBS_VALUE": "5"
},
{
"@TIME_PERIOD": "2020",
"@OBS_VALUE": "1"
},
{
"@TIME_PERIOD": "2021",
"@OBS_VALUE": "5"
}
]
},
{
"@FREQ": "A",
"@REF_AREA": "CI",
"@INDICATOR": "NGDP_R_PC_PP_PT",
"@UNIT_MULT": "0",
"@TIME_FORMAT": "P1Y",
"Obs": [
{
"@TIME_PERIOD": "2018",
"@OBS_VALUE": "6"
},
{
"@TIME_PERIOD": "2019",
"@OBS_VALUE": "6"
},
{
"@TIME_PERIOD": "2020",
"@OBS_VALUE": "2"
},
{
"@TIME_PERIOD": "2021",
"@OBS_VALUE": "8"
}
]
}
]
}
} And I want an array that looks like this, each of the years and values from each 'Obs' array in its own array:我想要一个看起来像这样的数组,每个“Obs”数组中的每个年份和值都在它自己的数组中:
var dataSet = [
[["2018","6"],["2019","5"],["2020","1"],["2021","5"]],
[["2018","6"],["2019","6"],["2020","2"],["2021","8"]]
]
I have tried this:我试过这个:
let dataO = []
var dataSet = data.Series.map((x,index) => {
dataO.push(x.Obs.map(i=>i['@TIME_PERIOD']))
dataO.push(x.Obs.map(r=>r['@OBS_VALUE']))
return dataO
})
But I get an array with 2 elements, each containing all of the data from the object.但是我得到了一个包含 2 个元素的数组,每个元素都包含来自 object 的所有数据。 I can't see where I am going wrong.
我看不出哪里出错了。 Any help is appreciated.
任何帮助表示赞赏。 Thanks!
谢谢!
Simple double loop:简单的双循环:
var dataSet = [];
data.DataSet.Series.map((x) => {
var periods = [];
x.Obs.map((y) => {
periods.push([y['@TIME_PERIOD'], y['@OBS_VALUE']]);
});
dataSet.push(periods);
});
Testable below:可测试如下:
var data = { "DataSet": { "Series": [{ "@FREQ": "A", "@REF_AREA": "BF", "@INDICATOR": "NGDP_R_PC_PP_PT", "@UNIT_MULT": "0", "@TIME_FORMAT": "P1Y", "Obs": [{ "@TIME_PERIOD": "2018", "@OBS_VALUE": "6" }, { "@TIME_PERIOD": "2019", "@OBS_VALUE": "5" }, { "@TIME_PERIOD": "2020", "@OBS_VALUE": "1" }, { "@TIME_PERIOD": "2021", "@OBS_VALUE": "5" } ] }, { "@FREQ": "A", "@REF_AREA": "CI", "@INDICATOR": "NGDP_R_PC_PP_PT", "@UNIT_MULT": "0", "@TIME_FORMAT": "P1Y", "Obs": [{ "@TIME_PERIOD": "2018", "@OBS_VALUE": "6" }, { "@TIME_PERIOD": "2019", "@OBS_VALUE": "6" }, { "@TIME_PERIOD": "2020", "@OBS_VALUE": "2" }, { "@TIME_PERIOD": "2021", "@OBS_VALUE": "8" } ] } ] } }; var dataSet = []; data.DataSet.Series.map((x) => { var periods = []; x.Obs.map((y) => { periods.push([y['@TIME_PERIOD'], y['@OBS_VALUE']]); }); dataSet.push(periods); }); console.log(dataSet);
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