Duffer Derek

export function shallowEqual(objA, objB, compare, compareContext) {
    let compareResult = compare ? compare.call(compareContext, objA, objB) : void 0;
    if (compareResult !== void 0) {
        return !!compareResult;
    }
    if (objA === objB) {
        return true;
    }
    if (typeof objA !== 'object' || !objA || typeof objB !== 'object' || !objB) {
        return false;
    }
    const keysA = Object.keys(objA);
    const keysB = Object.keys(objB);
    if (keysA.length !== keysB.length) {
        return false;
    }
    const bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB);
    // Test for A's keys different from B.
    for(let idx = 0; idx < keysA.length; idx++){
        const key = keysA[idx];
        if (!bHasOwnProperty(key)) {
            return false;
        }
        const valueA = objA[key];
        const valueB = objB[key];
        compareResult = compare ? compare.call(compareContext, valueA, valueB, key) : void 0;
        if (compareResult === false || compareResult === void 0 && valueA !== valueB) {
            return false;
        }
    }
    return true;
}

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