React utility for nextProps diff (Shallow check)

NextPropsDiff.js

// Use it with the componentWillReceiveProps lifecycle method
//
// componentWillReceiveProps(nextProps) {
//    shallowEqual(this.props, nextProps);
// }
//

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++) {
        if (!hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
            console.log(keysA[i]);
            return false
        }
    }
    return true
}

function is(x, y) {
    if (x === y) {
        return x !== 0 || 1 / x === 1 / y
    } else {
        return x !== x && y !== y
    }
}