typescript check if value is null code example

Example 1: javascript check if null

if (variable === null) { //Executes only if variable is null but not undefined
  //Code here
}

if (variable == null) { //Executes if variable is null OR undefined
  //Code here
}

Example 2: typescript null and undefined check

if(!!someValue)

Example 3: how to check is null or empty in typescript

if(typeof propertyValue!='undefined' && propertyValue){
	//execute code here
}

Example 4: typescript null and undefined check

let x = foo?.bar.baz();