math – JavaScript exponents-ThrowExceptions

Exception or error:

How do you do exponents in JavaScript?

Like how would you do 12^2?

How to solve:

There is an exponentiation operator, which is part of the ES7 final specification. It is supposed to work in a similar manner with python and matlab:

a**b // will rise a to the power b

Now it is already implemented in Edge14, Chrome52, and also it is available with traceur or babel.



js> Math.pow(12, 2)


Math.pow(base, exponent), for starters.


Math.pow(12, 2)


Math.pow(x, y) works fine for x^y and even evaluates the expression when y is not an integer. A piece of code not relying on Math.pow but that can only evaluate integer exponents is:

function exp(base, exponent) {
  exponent = Math.round(exponent);
  if (exponent == 0) {
    return 1;
  if (exponent < 0) {
    return 1 / exp(base, -exponent);
  if (exponent > 0) {
    return base * exp(base, exponent - 1)


How we perform exponents in JavaScript
According to MDN
The exponentiation operator returns the result of raising the first operand to the power second operand. That is, var1 var2, in the preceding statement, where var1 and var2 are variables. Exponentiation operator is right associative: a ** b ** c is equal to a ** (b ** c).
For example:
2**3 // here 2 will multiply 3 times by 2 and the result will be 8.
4**4 // here 4 will multiply 4 times by 4 and the result will be 256.

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