标签 javascript arrays json
<分区>
我正在尝试计算此 JSON 文件中每个元素的出现次数。
[
{
"firstName": "Sena",
"lastName": "Turan",
"age": 19,
"retired": false
},
{
"firstName": "Çınar",
"lastName": "Turan",
"age": 1,
"retired": false
},
{
"firstName": "Ahmet",
"lastName": "Turan",
"age": 55,
"retired": true
}
]
比如它包含多少个“firstName”或“age”变量。有人对此有意见吗？谢谢。
最佳答案
您可以减少数组并增加数组对象中每个元素的计数:
const arr = [{ "firstName" : "Sena", "lastName" : "Turan", "age" : 19, "retired" : false}, {"firstName" : "Çınar", "lastName" : "Turan", "age" : 1, "retired" : false}, {"firstName" : "Ahmet", "lastName" : "Turan", "age" : 55, "retired" : true} ];
const result = arr.reduce((acc, curr) => {
for(let el in curr) {
acc[el] = acc[el] == null ? 1 : acc[el] + 1;
}
return acc;
}, {});
console.log(result);关于javascript - 如何计算 JavaScript 中对象数组中的某些元素？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63284207/