var numberObj = {};
var third = 97;
var mult=0;

numberObj['ArrayInObj']= [22, 22 , third];

numberObj.ArrayInObj.forEach((value, index)=>{
    console.log(`ArrayInObject[${index}]: ${value}`);
    this.mult = this.mult + value;
    console.log('Value of Mult:'+ this.mult);
});

console.log('Value of Mult:'+ this.mult);