<pre class="shiki github-dark shaku"><code>// interface Laziness {// sleep: (time: number) =&gt; Laziness// sleepFirst: (time: number) =&gt; Laziness// eat: (food: string) =&gt; Laziness// }/** * @param {string} name * @param {(log: string) =&gt; void} logFn * @returns {Laziness} */function LazyMan(name, logFn) { // your code here const tasks = []; function next(){ if(tasks.length === 0) return; const task = tasks.shift(); task(); } tasks.unshift(()=&gt;{ logFn(`Hi, I'm ${name}.`); next(); }) const api ={ eat(food){ tasks.push(()=&gt;{ logFn(`Eat ${food}.`); next(); }) return api; }, sleep(time){ tasks.push(()=&gt;{ setTimeout(()=&gt;{ logFn(`Wake up after ${time} second${time&gt; 1 ? "s":""}.`); next(); },time*1000) }) return api; }, sleepFirst(time){ tasks.unshift(()=&gt;{ setTimeout(()=&gt;{ logFn(`Wake up after ${time} second${time&gt; 1 ? "s":""}.`); next(); },time*1000) }) return api; } } setTimeout(next,0); return api;}LazyMan('Jack', console.log) .eat('banana') .sleepFirst(10) .eat('apple') .sleep(1)</code></pre>

O(n)2 worst case

LazyMan is very lazy, he only eats and sleeps. LazyMan(name: string, logFn: (log: string) => void) would output a message, the passed logFn is used. L…