powerFunction.js

function power(base, exponent) {
  let result = 1;
  for (let i = 0; i < Math.floor(exponent); i++) {
    result *= base;
  }
  if (exponent % 1 !== 0) {
    result *= base ** (exponent % 1);
  }
  return result;
}

const base = 2;
const exponent = 2.5;
const result = power(base, exponent);
console.log(result);