56 lines
1.1 KiB
TypeScript
56 lines
1.1 KiB
TypeScript
export function shallowEqual<T>(
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objA: T,
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objB: T,
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compare?: (a: T, b: T, key?: string) => boolean | void,
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compareContext?: any,
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) {
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let compareResult = compare
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? compare.call(compareContext, objA, objB)
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: void 0
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if (compareResult !== void 0) {
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return !!compareResult
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}
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if (objA === objB) {
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return true
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}
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if (typeof objA !== 'object' || !objA || typeof objB !== 'object' || !objB) {
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return false
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}
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const keysA = Object.keys(objA)
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const keysB = Object.keys(objB)
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if (keysA.length !== keysB.length) {
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return false
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}
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const bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB)
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// Test for A's keys different from B.
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for (let idx = 0; idx < keysA.length; idx++) {
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const key = keysA[idx] as string
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if (!bHasOwnProperty(key)) {
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return false
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}
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const valueA = (objA as any)[key]
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const valueB = (objB as any)[key]
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compareResult = compare
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? compare.call(compareContext, valueA, valueB, key)
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: void 0
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if (
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compareResult === false ||
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(compareResult === void 0 && valueA !== valueB)
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) {
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return false
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}
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}
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return true
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}
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