<pre class="shiki github-dark shaku"><code>/*type Callback = (error: Error, data: any) =&gt; voidtype AsyncFunc = ( callback: Callback, data: any) =&gt; void*//** * @param {AsyncFunc[]} funcs * @return {(callback: Callback) =&gt; void} */function sequence(funcs){ return function(callback, data) { let nextFuncInx = 0; const callNextFunc = (data) =&gt; { if(nextFuncInx === funcs.length) { callback(undefined, data) return; } //get nextfunc const nextFunc = funcs[nextFuncInx]; nextFuncInx +=1; //call next func with (cb, data) nextFunc((error, newData) =&gt; { if(error) { callback(error, undefined); } else { callNextFunc(newData); } }, data) } callNextFunc(data); }}</code></pre>

my sequence

This problem is similar to 11. what is Composition? create a pipe(). You are asked to implement an async function helper, sequence() which chains up a…