Javascript:Guess output of given code

 

Guess Output of following code

Code:

function sumNumber(a,b){

    "use strict"

    a=30;

    b=50;

    return arguments[0] + arguments[1];

}

let sum = sumNumber(10,20);

console.log(`sum=${sum}`)

Output:

sum=30

Explanation:

   if we add use strict them we can't override value of

   function parameter inside function.