reduce using typescript

//reduce takes a array and return a single item

interface student

{

name:string,

age:number,

//total marks from 600

marks:number

}

var studentList:Array<student>=[

{name:"seema",age:25,marks:400},

{name:"manish",age:25,marks:300},

{name:"sachin",age:25,marks:400},

{name:"nishi",age:25,marks:272},

{name:"ranjeet",age:25,marks:450}

]

const totalMarks=studentList.reduce((acc,studentObject)=>{

acc+=studentObject.marks

return acc;

},0)

//percentage marks scored by each student

var percentage=Math.round(totalMarks/studentList.length);

code link= https://stackblitz.com/edit/typescript-5ms7ug