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fix: comparison for empty/nil, fixes #321

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This commit is contained in:
Jun Yang
2021-03-13 17:14:08 +08:00
parent aff9976042
commit 99d14e76d7
6 changed files with 36 additions and 11 deletions
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src/drop/empty-drop.ts
+3 -1
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@@ -1,9 +1,11 @@
import { Drop } from './drop'
import { Comparable } from './comparable'
import { isObject, isString, isArray } from '../util/underscore'
import { isObject, isString, isArray, toValue } from '../util/underscore'
export class EmptyDrop extends Drop implements Comparable {
public equals (value: any) {
if (value instanceof EmptyDrop) return false
value = toValue(value)
if (isString(value) || isArray(value)) return value.length === 0
if (isObject(value)) return Object.keys(value).length === 0
return false