'use strict';

const { log: ln } = Math;
const log = (base, n) => ln(n) / ln(base);

// Usage
{
  const lg = log.bind(null, 10);
  const ln = log.bind(null, Math.E);

  console.log(`lg(5) = ${lg(5)}`);
  console.log(`ln(5) = ${ln(5)}`);
}