Which is an equivalent code to invoke a function m of class o that expects two a

Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?

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1) Consider the following code snippet

function hypotenuse(a, b)
  {
        function square(x)
         {
              return x*x;
         }
        return Math.sqrt(square(a) + square(b));
 }

2) Consider the following code snippet :

function constfuncs()
  {
     var funcs = [];
     for(var i = 0; i < 10; i++)
         funcs[i] = function()
 {
 return i;
 };
     return funcs; }
 var funcs = constfuncs();
 funcs[5]()

3) What will happen if a return statement does not have an associated expression?

4) Consider the following code snippet :

var string2Num=parseInt("123xyz");

5) Do functions in JavaScript necessarily return a value ?