javascript check variable has no value code example

Example 1: javascript is not null

if(data !== null && data !== '') {
   // do something
}

Example 2: javascript check if not null

//Even if the value is 0, this will execute. 

if (myVar !== null) {...}

//If you don't want it to execute when it's 0, then set it as

if (myVar) {...}

//This will return false if var value is 0.