lazzy.ts/generators/fibonacci.js

Fast and lightweight library for lazy operations with iterable objects.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.fibonacci = void 0;
function* fibonacci(minimum = 1) {
    let [prev, next] = findClosestFibonacci(minimum);
    while (true) {
        const current = prev;
        prev = next;
        next += current;
        const reply = yield current;
        if (reply != null) {
            [prev, next] = findClosestFibonacci(reply);
        }
    }
}
exports.fibonacci = fibonacci;
;
function findClosestFibonacci(n, prev = 0, next = 1) {
    if (next < n) {
        return findClosestFibonacci(n, next, prev + next);
    }
    return [next, prev + next];
}
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