null acts as a number and object at the same time. Comparing null >= 0 or null <= 0 results in true . Comparing null === 0 or null > ... ... <看更多>

Javascript null is a primitive type that has one value null. · JavaScript uses the null value to represent a missing object. · Use the strict equality operator ( ... ... <看更多>

The primitive values null and undefined have a distinct difference that should be used. But how to you tell the ... ... <看更多>

null is the only primitive value that is 'falsy' but also returns. * "object" from the typeof check. */. function is_null(obj) {. ... <看更多>

You are doing mistake with reduce method syntax. Yoiu need to find attribute and then need to validate value while currently it looks like ... ... <看更多>