javscript Ternary operator if json value is null-CodePudding

I want to return false if null is returned, but it keeps returning true even when it returns null.

hello.json.

{
  "hello": null
}

or 

{
 "hello" : {
    id: 1,
    hi: 'hi'
   } 
}

console.log(hello === null ? false : true)

The hello value is output as a null value and I want to return false. What should I do?

console.log((hello === null ? 'false' : 'true'))

If hello is null, I expected false to come out, but it came out true.

CodePudding user response：

Add console.log(hello); before your current console.log to find out what is actually coming into the hello variable/field.

I think the current value of hello is undefined, so the result in your conditional statement is true.

CodePudding user response：

You have to pass obj.key

obj = {
 "hello" : null
}
console.log(obj.hello === null ? false : true)

CodePudding user response：

if(YourObject.hello) {
 return true;
}
else{ 
 return false; 
}

Using ternary operator

console.log((YourObject.hello) ? true : false);

will evaluate to true if the value is not:

CodePudding user response：

You are creating an object, but accessing it wrong, you need to access the object's value like this:

obj = {
 "hello" : null
}
obj.hello === null ? false : true

CodePudding user response：

if value of hello is null, it returns false anyway, therefore doing that has no meaning.