typescript check if null or undefined or empty string code example

Example 1: javascript check if undefined or null or empty string

// simple check do the job
if (myString) {
 // comes here either myString is not null,
 // or myString is not undefined,
 // or myString is not '' (empty).
}

Example 2: how to check is null or empty in typescript

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