locutus/esm/python/math/log.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function log(x, base) {
    //      discuss at: https://locutus.io/python/log/
    // parity verified: Python 3.12
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Returns the natural logarithm of x (base e)
    //          note 2: If base is provided, returns log(x) / log(base)
    //       example 1: log(1)
    //       returns 1: 0
    //       example 2: log(2.718281828459045)
    //       returns 2: 1
    if (base === undefined) {
        return Math.log(x);
    }
    return Math.log(x) / Math.log(base);
}