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27 lines
556 B
27 lines
556 B
/* eslint-disable required-modules */
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'use strict';
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const assert = require('assert');
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const kLimit = Symbol('limit');
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const kCallback = Symbol('callback');
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class Countdown {
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constructor(limit, cb) {
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assert.strictEqual(typeof limit, 'number');
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assert.strictEqual(typeof cb, 'function');
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this[kLimit] = limit;
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this[kCallback] = cb;
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}
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dec() {
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assert(this[kLimit] > 0, 'Countdown expired');
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if (--this[kLimit] === 0)
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this[kCallback]();
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}
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get remaining() {
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return this[kLimit];
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}
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}
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module.exports = Countdown;
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