我有一个像这样的对象数组:
const customers = [
{
customer_name: 'Negan',
customer_age: 45,
customer_weapon: 'Bat',
customer_email: 'negan@sanctuary.com',
customer_city: 'Washington'
},
{
customer_name: 'Daryl',
customer_age: 41,
customer_weapon: 'Crossbow',
customer_email: 'daryl.dixon@kickass.com',
customer_city: 'Atlanta'
},
{
customer_name: 'Rick',
customer_age: 45,
customer_weapon: 'Magnum 357',
customer_email: 'rick@alexandria.com',
customer_city: 'King County'
},
]
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我想用这些键替换对象内的所有键:
const newKeys = [
'firstname',
'age',
'weapon',
'email',
'city'
]
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做这个的最好方式是什么?一个例子将不胜感激!
我有一个带有这样日期的对象
const dateObject = {
"BaseTransactions.maxOccurredAt": "2021-01-19T20:30:45.000",
"BaseTransactions.minOccurredAt": "2016-12-28T12:55:37.000",
"EmailCampaignEvents.maxOccurredAt": "2021-04-13T11:32:50.000",
"EmailCampaignEvents.minOccurredAt": "2021-04-09T12:15:26.000",
};
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我用它创建了一个数组,其中的日期如下
const arrayOfDates: Date[] = Object.values(dateObject).map(
(date: string | unknown) => new Date(date as string)
);
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我正在尝试从该数组中获取最小和最大日期,如下所示
const minDate = new Date(Math.min.apply(null, arrayOfDates));
const maxDate = new Date(Math.max.apply(null, arrayOfDates));
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arrayOfDates但我在Math.min 和 Math.max 内部收到打字稿错误。错误是这样说的Argument of type 'Date[]' is not assignable to parameter of type 'number[]'. Type 'Date' is not assignable to type 'number'.ts(2345)。我究竟做错了什么?
我有一个带有几个复选框的下拉菜单,我试图在每个复选框上添加 onClick 事件。但是当我选中其中一个复选框时,所有复选框都会被选中。这就是我尝试做的:
const [isChecked, setIsChecked] = React.useState(false);
const isCheckboxChecked = () => {
setIsChecked(isChecked ? false : true)
}
return menuItems.map((item, index) => (
<React.Fragment>
<MenuItem
value={item.value}
selected={item.value === value}
key={index}
>
<Checkbox
key={index}
checked={isChecked}
onClick={() => isCheckboxChecked()}
>
<Label>{item.label}</Label>
</Checkbox>
</MenuItem>
{index === 2 || index === 3 ? <hr /> : null}
</React.Fragment>
));
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据我了解,所有复选框都使用相同的状态isChecked,我想知道如何使它们独立。
arrays ×2
checkbox ×1
date ×1
ecmascript-6 ×1
javascript ×1
material-ui ×1
object ×1
reactjs ×1
typescript ×1