根据条件过滤对象

Question

我有一个对象作为

sports={
   "cricket":true,
   "football":true,
   "tennis":false
}

我想把所有真实的体育信息过滤到一个像[cricket,football]这样的数组中

Answer 1

下面的代码返回数组中真值的键，如cricket，football

const sports = {
  cricket: true,
  football: true,
  tennis: false,
};

const result = Object.keys(sports).filter((current) => {
  return sports[current];
});

Answer 2

使用for...in结构：

​

sports={
   cricket:true,
   football:true,
   tennis:false
}
const result = []
for(const sport in sports) {
 if (sports[sport]) result.push(sport)
}
console.log(result)

​

有关for...in的更多信息，请访问：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Answer 3

var sports_arr = Object.keys(sports);
var tmp = [];
for(var i = 0; i < sports_arr.length && sports[sports_arr[i]]; i++)
  tmp.push(sports_arr[i]);