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

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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));
}

What does the above code result?

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]()

What does the last statement return ?

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

4) Consider the following code snippet :

var string2Num=parseInt("123xyz");

The result for the above code snippet would be :

5) Do functions in JavaScript necessarily return a value ?

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