__python__.js

const range = len => Array.from({ length: len }, (_, i) => i + 1)
const len = array => array.length

const map = Array.prototype.map
const filter = Array.prototype.filter
const reduce = Array.prototype.reduce


String.prototype.join = function(array) { return array.join(this) }

Object.prototype.items = function() { return Object.entries(this) }