Checking for Undefined In React

Question

I have a scenario where I\'m passing data from a reducer into my react state.

data:

{
    \"id\": 1,
    \"title\": \"Test\",
    \"content\": {
            


        

Answer 1

In case you also need to check if nextProps.blog is not undefined ; you can do that in a single if statement, like this:

if (typeof nextProps.blog !== "undefined" && typeof nextProps.blog.content !== "undefined") {
    //
}

And, when an undefined , empty or null value is not expected; you can make it more concise:

if (nextProps.blog && nextProps.blog.content) {
    //
}