The ** operator returns the result of the first variable to the power of the second variable. That is, Math.pow(a,b).
var a = 2;
var b = 5;
a ** b; // 32
Math.pow(a, b); // 32
If we do like a ** b ** c , then the operation is computed from right-to-left , that is a ** (b**c)
var a = 5, b = 2, c = 2;
a ** b ** c; // 625
// Execution order of a ** b ** c;
(5 ** (2 ** 2) )
(5 ** 4)
625
You cannot put a unary operator (+/-/~/!/delete/void/typeof) immediately before the base number.
// Invalid Operations
+a ** b;
-a ** b;
~a ** b;
!a ** b;
delete a ** b;
void a ** b;
typeof a ** b;
// All the above operation are invalid and result in
Uncaught SyntaxError: Unary operator used immediately before exponentiation expression. Parenthesis must be used to disambiguate operator precedence
Handling negative numbers
-2 ** 2; //invalid
// The above expression can be converted into
(-2) ** 2; // 4
(-2) ** 3; //-8
Any operation on NaN is NaN
NaN ** 1; //NaN
NaN ** NaN; // NaN
What will happen on using undefined:
1 ** undefined; // NaN
// because
1 ** Number(undefined);
1 ** NaN; // NaN
Similarly when we do ** on null, Number(null) → 0, so the power of 0 is 1.
10 ** null; // 1
// because
10 ** Number(null); // Number(null) --> 0
10 ** 0; // 1
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