The double asterisk ** operator in Javascript

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New day, a new discovery! Today I've learned there that Javascript has a double asterisk ** operator.

So, it's perfectly valid to write:

const x = 2 ** 3
// x is 8, meaning 2 raised to a power of 3

const y = x ** 2
// x is 64, squared x

The double asterisk ** operator was introduced in ECMAScript 2016 and it's also named the exponentiation operator.

Writing x ** y it's the same as writing Math.pow(2, 3).

It works also with negative or fractional values:

const z = 7 ** -2 
// z is 0.02040816326530612, 1 / 49

const t = 4 ** 0.5 
// t is 2

And we also have the exponentiation assignment:

x **= y
// meaning x = x ** y

The support for the double asterisk is great, works everywhere except IE.

And speaking of lesser-known operators in Javascript, we also have a double tilde Js operator.

šŸ“– Neural networks for Javascript developers

The Neural Networks for JavaScript developers book is almost ready! Learn the basics of AI with TensorFlowJs examples. Join now the presale and get a 15$ coupon off the launching price!


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