当key匹配时替换数组的值吗？
当key匹配时替换数组的值吗？
提问于 2019-11-19 18:36:49
当键值匹配时，我的实际代码不会推送对象，但是当键值匹配时，我如何更新键值呢？
this.state.data.concat(items).filter(function (a) {
return !this[a.key] && (this[a.key] = true);
}, Object.create(null))回答 1
Stack Overflow用户
发布于 2019-11-19 21:01:41
// some object we want to change
const items = {
a: true,
b: false,
v: true,
g: true
};
// some value we want to match with object key
let someKeyWeWantToMatch = "b";
// for of loop
for (let [key, value] of Object.entries(items)) {
// if key matches...
if (key === someKeyWeWantToMatch) {
// ...change its value
items[key] = true;
}
}
// and we are done
console.log(items);
/*
EXPLANATION:
Objects are not iterable, so if we want to iterate throught them we have to make an Map out of them
We do this with: Object.entries(objectName)
So object goes from this:
{a:'aaa'}
Into this:
['a','aaa']
Then we can easily check the value of its key, and change it if we want.
*/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/58932025
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