如何将字典追加到列表中？
如何将字典追加到列表中？
提问于 2019-09-29 13:57:10
我正在尝试创建一个for循环，它将值存储在一个字典中，并且每次迭代都将这个字典附加到一个列表中。
已尝试使用push()和索引列表进行附加，但未成功。
json = {
"MUNICIPIOS":[
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [10, 100, 1000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [20, 200, 2000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [30, 300, 3000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [40, 400, 4000]}
]
};
var atributos = json["MUNICIPIOS"][0]["ATRIBUTOS"];
var municipios = json["MUNICIPIOS"];
var dimensoes = [];
var dicionario = {label:"", values:[]};
for (var atr = 0; atr < atributos.length; atr++){
dicionario.label = atributos[atr];
valores = [];
for (var mun=0; mun < municipios.length; mun++){
valores.push(municipios[mun]["VALORES"][atr]);
dicionario.values = valores;
}
//dimensoes.push(dicionario);
dimensoes[atr] = dicionario;
}
console.log(dimensoes);结果并不像我希望的那样：
// Actual result
[
{ label: 'atrib3', values: [ 1000, 2000, 3000, 4000 ] },
{ label: 'atrib3', values: [ 1000, 2000, 3000, 4000 ] },
{ label: 'atrib3', values: [ 1000, 2000, 3000, 4000 ] }
]我需要这个：
// Expected result
[
{ label: 'atrib1', values: [ 10, 20, 30, 40 ] },
{ label: 'atrib2', values: [ 100, 200, 300, 400 ] },
{ label: 'atrib3', values: [ 1000, 2000, 3000, 4000 ] }
]我做错了什么？
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-09-29 14:15:15
代码的问题在于您“填充”dicionario的位置--所有输出dimensoes[atr]都使用和修改了这个对象
var dicionario = {label:"", values:[]};
for (var atr = 0; atr < atributos.length; atr++){
dicionario.label = atributos[atr];
// snip - rest of your code
dimensoes[atr] = dicionario;
}一种解决方案是更改代码，以便每次迭代都有一个新的dicionario对象可用
var dicionario = {label:"", values:[]};
for (var atr = 0; atr < atributos.length; atr++){
dicionario = {label:atributos[atr], values:[]};
//dicionario.label = atributos[atr]; not required as it is set above
// snip - rest of your code
dimensoes[atr] = dicionario;
}但是，对于整洁的ES6+解决方案：
const json = {
"MUNICIPIOS":[
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [10, 100, 1000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [20, 200, 2000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [30, 300, 3000]},
{"ATRIBUTOS":["atrib1","atrib2","atrib3"],"VALORES": [40, 400, 4000]}
]
};
const atributos = json.MUNICIPIOS[0].ATRIBUTOS;
const municipios = json.MUNICIPIOS;
const dimensoes = atributos.map((label, atr) => ({
label,
values: municipios.map(municipio => municipio.VALORES[atr])
}));
console.log(JSON.stringify(dimensoes, null, 4));
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58152666
复制相关文章
相似问题
腾讯云开发者
