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--- | ||
category: Utilities | ||
--- | ||
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# useArrayReduce | ||
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Reactively array reduce. | ||
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## Usage | ||
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```js | ||
import { useArrayReduce } from '@vueuse/core' | ||
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const sum = useArrayReduce([ref(1), ref(2), ref(3)], (sum, val) => sum + val) | ||
// sum.value: 6 | ||
``` | ||
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### Use with reactive array | ||
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```js | ||
import { useArrayReduce } from '@vueuse/core' | ||
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const list = reactive([1, 2]) | ||
const sum = useArrayReduce(list, (sum, val) => sum + val) | ||
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list.push(3) | ||
// sum.value: 6 | ||
``` | ||
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### Use with initialValue | ||
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```js | ||
import { useArrayReduce } from '@vueuse/core' | ||
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const list = reactive([{ num: 1 }, { num: 2 }]) | ||
const sum = useArrayReduce(list, (sum, val) => sum + val.num, 0) | ||
// sum.value: 3 | ||
``` |
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import { reactive, ref } from 'vue-demi' | ||
import { useSetup } from '../../.test' | ||
import { useArrayReduce } from '../useArrayReduce' | ||
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describe('useArrayReduce', () => { | ||
it('should be defined', () => { | ||
expect(useArrayReduce).toBeDefined() | ||
}) | ||
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it('should calulate the array sum', () => { | ||
useSetup(() => { | ||
const item1 = ref(1) | ||
const item2 = ref(2) | ||
const sum = useArrayReduce([item1, item2, 3], (a, b) => a + b) | ||
expect(sum.value).toBe(6) | ||
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item1.value = 4 | ||
expect(sum.value).toBe(9) | ||
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item2.value = 3 | ||
expect(sum.value).toBe(10) | ||
}) | ||
}) | ||
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it('should work with reactive array', () => { | ||
useSetup(() => { | ||
const list = reactive([1, 2]) | ||
const sum = useArrayReduce(list, (a, b) => a + b) | ||
expect(sum.value).toBe(3) | ||
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list.push(3) | ||
expect(sum.value).toBe(6) | ||
}) | ||
}) | ||
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it('should work with initialValue', () => { | ||
const list = reactive([{ num: 1 }, { num: 2 }]) | ||
const sum = useArrayReduce(list, (sum, val) => sum + val.num, 0) | ||
expect(sum.value).toBe(3) | ||
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list.push({ num: 3 }) | ||
expect(sum.value).toBe(6) | ||
}) | ||
}) |
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import type { MaybeComputedRef } from '@vueuse/shared' | ||
import type { ComputedRef } from 'vue-demi' | ||
import { resolveUnref } from '@vueuse/shared' | ||
import { computed } from 'vue-demi' | ||
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export type UseArrayReducer<PV, CV, R> = (previousValue: PV, currentValue: CV, currentIndex: number) => R | ||
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export function useArrayReduce<T>( | ||
list: MaybeComputedRef<MaybeComputedRef<T>[]>, | ||
reducer: UseArrayReducer<T, T, T>, | ||
): ComputedRef<T> | ||
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export function useArrayReduce<T, U>( | ||
list: MaybeComputedRef<MaybeComputedRef<T>[]>, | ||
reducer: UseArrayReducer<U, T, U>, | ||
initialValue: U, | ||
): ComputedRef<U> | ||
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export function useArrayReduce<T>( | ||
list: MaybeComputedRef<MaybeComputedRef<T>[]>, | ||
reducer: ((...p: any[]) => any), | ||
...args: any[] | ||
): ComputedRef<T> { | ||
return computed(() => { | ||
const reduce = Array.prototype.reduce.bind(resolveUnref(list)) | ||
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const reduceCallback = (sum: any, value: any, index: number) => reducer(resolveUnref(sum), resolveUnref(value), index) | ||
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// Depending on the behavior of reduce, undefined is also a valid initialization value, | ||
// and this code will distinguish the behavior between them. | ||
return args.length | ||
? reduce(reduceCallback, args[0]) | ||
: reduce(reduceCallback) | ||
}) | ||
} |