The exponentiation operator is an arithmetic operator introduced in ES2016.
A double asterisk is used to calculate the exponent value of a number.
It is equivalent to the traditional pow() function of the Math library.
let a = 2; let b = 3; /*from w ww . j av a2 s. co m*/ a ** b //8 Math.pow(a, b) // 8
Using the exponentiation Operator is a quick way to calculate the value when a number is raised to the corresponding power.