TS/JS marathon codes

let arr: number[] = [1,2,3,4,5,6,7,8,9,10];
let outcome: number = arr.reduce(
  (acc,cur)=>
  {
    return acc+cur;
  }
)
console.log(outcome
// outcome = 55

let arr: number[] = [1,2,3,4,5,6,7,8,9,10];
let outcome: number = arr.reduce(
  (acc,cur)=>
  {
    return acc+cur;
  },
//set an initial value "10"
  10
)
console.log(outcome)
// outcome = 65

let arr: number[] = [1,2,3,4,5,6,7,8,9,10];
let outcome: number = arr.reduce(
  (acc,cur)=>
  {
   return acc+cur
  }
)
let average: number = outcome/arr.length
console.log(average)
// average = 5.5

interface Kureshin {
  name: string;
  age: number;
}

const noharake: Kureshin[] =[
  {name: "Shin-nosuke", age: 5},
  {name: "Misae", age:29},
  {name: "Hiroshi", age:35},
  {name: "Himawari", age: 0},
  {name: "Shiro", age:3}
]
let totalAge: number =
noharake.reduce(
  (acc,cur)=>
  {
    return acc+cur.age
  },
  0
)
console.log(totalAge)
// totalAge = 5+29+35+0+3 = 72