SOURCE

const PromiseAll = (itetator)=>{
    let results = [];
    let promises = Array.from(itetator);
    let len = promises.length;
    let count = 0;
    return new Promise((resolve,reject)=>{
        for(let i in promises){
            Promise.resolve(promises[i]).then(res=>{
                results[i] = res;
                count++;
                if(count === len){
                    resolve(results)
                }
            }).catch(err=>{
                reject(err)
            })
        }
    })
}