prevPow - nodef/extra-number GitHub Wiki
Find largest power-of-n less than or equal to given number.
function prevPow(x, n)
// x: a number
// n: base
const xnumber = require('extra-number');
xnumber.prevPow(32, 2);
// → 32
xnumber.prevPow(35, 2);
// → 32
xnumber.prevPow(35, 3);
// → 27