JavaScript управляет циклами

Question

Создал скрипт, который получает массив строк и фильтрует дубликат свободной отдельной строки.

Answer 1

const a = [ 
    "Leetmeme: Cyberportal", 
    "Cyberportal: Ice,Fraudstream", 
    "CamelCaser: KittenService", 
    "Fraudstream: Leetmeme", 
    "KittenService:", 
    "Ice:" 
]; 

//transforming `a` into a reasonable structure 
let identity = v => v; 
let dependencies = a.reduce((acc, str) => { 
    let [key, ...deps] = str.split(/[:,]\s*/g).filter(identity); 
    acc[key] = deps; 
    return acc 
}, {}); 

let depth = 0; //just for logging 
let status = {}; 
let load = (acc, module) => { 
    if(status[module] === "loading"){ 
     var circle = Object.keys(status).filter(k => status[k] === "loading").concat(module); 
     throw new Error("circular reference found: " + circle); 
    } 

    if(status[module] !== "done"){ 
     console.log(" ".repeat(depth++), module); 
     status[module] = "loading"; 
     let deps = dependencies[module] || []; 
     deps.reduce(load, acc).push(module); 
     status[module] = "done"; 
     --depth; 
    } 
    return acc; 
} 

let order = Object.keys(dependencies).reduce(load, []); 
console.log(order);