2700. Differences Between Two Objects

https://leetcode.com/problems/differences-between-two-objects/

Javascript

function objDiff(obj1, obj2) {
    // 1: Pure value
    if (!isObject(obj1) && !isObject(obj2)) {
        return obj1 === obj2 ? {} : [obj1, obj2]
    }

    // 2. Only one of them is Null or Array
    if (!isObject(obj1) || !isObject(obj2)) {
        return [obj1, obj2]
    }

    // 3. Array
    if (Array.isArray(obj1) !== Array.isArray(obj2)) {
        return [obj1, obj2]
    }

    // 4. Compare recursive
    const diffs = {}
    for (const key in obj1) {
        if (!(key in obj2)) {
            continue
        }

        const result = objDiff(obj1[key], obj2[key])
        if (Object.keys(result).length) {
            diffs[key] = result
        }
    }

    return diffs
}

function isObject(obj) {
    return obj !== null && typeof obj === "object"
}