Javascript Function

Question

I'm new to javascript and having a little trouble understanding functions.

I need write a function that will receive a single numeric value, square the value and return the value for use. Name the function myUsefulFunction.

I got this far but now cant figure how to square the value

var aNumber = 18;
function myUsefulFunction(x){
 return aNumber = aNumber/x;
}
var amendedValue = doubleNumber(2);
console.log(amendedValue);

Any help would be greatly appreciated.

• dale landry: Does this answer your question: stackoverflow.com/questions/26593302/…
• Markus Zeller: Does this answer your question? What's the fastest way to square a number in JavaScript?

Answer 1

In Javascript, there are several ways to square numbers. For instance, there are ways you can get 3 squared.

Math.pow(3, 2) // Math.pow raises the base to any power Math.pow(base, power)
3 ** 2 // ** is a shorthand and does the same thing as Math.pow, base ** power
3 * 3 // just multiplies 3 to itself

All three of these are equally valid, and they're all widely used.

So if you want to create a function that squares a number, you can do something like this:

function myUsefulFunction(x) {
 return x * x
}

Then you can use this function:

console.log(myUsefulFunction(3)) // 9
console.log(myUsefulFunction(4)) // 16
console.log(myUsefulFunction(-5)) // 25
console.log(myUsefulFunction(2.5)) // 6.25

Answer 2

To square would mean to multiply by itself. Could try this.

const myUsefulFunction= (num) => {
 return num * num;
}
console.log(myUsefulFunction(10));

This will print out 100