angular check null or undefined variable code example

Example 1: javascript check for null variables

var myVar=null;

if(myVar === null){
    //I am null;
}

if (typeof myVar === 'undefined'){
    //myVar is undefined
}

Example 2: isnull or empty typescript

if(typeof namedProperty!='undefined' && namedProperty){
   return this.namedProperty;
}