reactivePick

从反应式性对象中反应式性地选取字段。

¥Reactively pick fields from a reactive object.

用法

¥Usage

基本用法

¥Basic Usage

import { reactivePick } from '@vueuse/core'

const obj = reactive({
  x: 0,
  y: 0,
  elementX: 0,
  elementY: 0,
})

const picked = reactivePick(obj, 'x', 'elementX') // { x: number, elementX: number }

谓词用法

¥Predicate Usage

import { reactivePick } from '@vueuse/core'

const source = reactive({
  foo: 'foo',
  bar: 'bar',
  baz: 'baz',
  qux: true,
})
const state = reactivePick(source, (value, key) => key !== 'bar' && value !== true)
// { foo: string, baz: string }
source.qux = false
// { foo: string, baz: string, qux: boolean }

应用场景

¥Scenarios

有选择地将属性传递给子级

¥Selectively passing props to child

<script setup>
import { reactivePick } from '@vueuse/core'

const props = defineProps({
  value: {
    default: 'value',
  },
  color: {
    type: String,
  },
  font: {
    type: String,
  }
})

const childProps = reactivePick(props, 'color', 'font')
</script>

<template>
  <div>
    <!-- only passes "color" and "font" props to child -->
    <ChildComp v-bind="childProps" />
  </div>
</template>

有选择地封装反应式对象

¥Selectively wrap reactive object

而不是这样做

¥Instead of doing this

import { useElementBounding } from '@vueuse/core'
import { reactive } from 'vue'

const { height, width } = useElementBounding() // object of refs
const size = reactive({ height, width })

现在我们可以拥有这个

¥Now we can just have this

import { reactivePick, useElementBounding } from '@vueuse/core'

const size = reactivePick(useElementBounding(), 'height', 'width')

类型声明

export type ReactivePickPredicate<T> = (
  value: T[keyof T],
  key: keyof T,
) => boolean
export declare function reactivePick<T extends object, K extends keyof T>(
  obj: T,
  ...keys: (K | K[])[]
): {
  [S in K]: UnwrapRef<T[S]>
}
export declare function reactivePick<T extends object>(
  obj: T,
  predicate: ReactivePickPredicate<T>,
): {
  [S in keyof T]?: UnwrapRef<T[S]>
}

源代码

源代码 • 文档

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