appbaseio/reactivesearch

// Credit to React-Redux for this util function
// https://github.com/reactjs/react-redux/blob/573db0bfc8d1d50fdb6e2a98bd8a7d4675fecf11/src/utils/shallowEqual.js

const hasOwn = Object.prototype.hasOwnProperty;

function is(x, y) {
    if (x === y) {
        return x !== 0 || y !== 0 || 1 / x === 1 / y;
    }
    // eslint-disable-next-line
    return x !== x && y !== y;
}

export default function shallowEqual(objA, objB) {
    if (is(objA, objB)) return true;
    if (
        typeof objA !== 'object'
        || objA === null
        || typeof objB !== 'object'
        || objB === null
    ) {
        return false;
    }

    const keysA = Object.keys(objA);
    const keysB = Object.keys(objB);

    if (keysA.length !== keysB.length) return false;

    for (let i = 0; i < keysA.length; i += 1) {
        if (!hasOwn.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
            return false;
        }
    }

    return true;
}