工业聚心爱的A Little JavaScript Problem

little.js

// statement https://lisperator.net/blog/a-little-javascript-problem/

const push = (stack, value) => (first) => first ? stack : value;
const range = (left, right) => (left > right ? null : push(range(left, right - 1), right));
const map = (stack, func) => (stack ? push(map(stack(1), func), func(stack(0))) : stack);
const foreach = (stack, func) => void map(stack, func);
const reverse = (stack, result = null) => stack ? reverse(stack(1), push(result, stack(0))) : result;



// You must not use arrays. The square bracket characters, [ and ], are forbidden, as well as Array constructor.

// You must not use objects. The curly braces, { and }, and the dot character (.) are forbidden. You may use curly braces for code blocks, but not for creating JavaScript objects.

// Should go without saying, these functions must be generic and do what their name implies. They must not be hard-coded for the particular 1..10 example.



var numbers = range(1, 10);
numbers = map(numbers, function (n) {
    return n * n;
});
numbers = reverse(numbers);
foreach(numbers, console.log);
/* output:

   100
   81
   64
   49
   36
   25
   16
   9
   4
   1
*/