Created
March 17, 2020 10:26
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shallowcompare
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module.exports = function shallowEqual(objA, objB, compare, compareContext) { | |
var ret = compare ? compare.call(compareContext, objA, objB) : void 0; | |
if (ret !== void 0) { | |
return !!ret; | |
} | |
if (objA === objB) { | |
return true; | |
} | |
if (typeof objA !== "object" || !objA || typeof objB !== "object" || !objB) { | |
return false; | |
} | |
var keysA = Object.keys(objA); | |
var keysB = Object.keys(objB); | |
if (keysA.length !== keysB.length) { | |
return false; | |
} | |
var bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB); | |
// Test for A's keys different from B. | |
for (var idx = 0; idx < keysA.length; idx++) { | |
var key = keysA[idx]; | |
if (!bHasOwnProperty(key)) { | |
return false; | |
} | |
var valueA = objA[key]; | |
var valueB = objB[key]; | |
ret = compare ? compare.call(compareContext, valueA, valueB, key) : void 0; | |
if (ret === false || (ret === void 0 && valueA !== valueB)) { | |
return false; | |
} | |
} | |
return true; | |
}; |
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