Pollyfill - PROMISE. ALL

const prom1 = new Promise(function (resolve, reject) { 
    setTimeout(() => { 
        resolve("gfg1") 
    }, 1000) 
}) 

const prom2 = new Promise(function (resolve, reject) { 
    setTimeout(() => { 
        reject("error") 
    }, 2000) 
}) 

const prom3 = new Promise(function (resolve, reject) { 
    setTimeout(() => { 
        resolve("gfg2") 
    }, 3000) 
}) 

const prom4 = new Promise(function (resolve, reject) { 
    setTimeout(() => { 
        resolve("gfg3") 
    }, 3000) 
}) 

Promise.myall = function (values) { 
    const promise = new Promise(function (resolve, reject) { 
        let result = []; 
        let total = 0; 
        values.forEach((item, index) => { 
            Promise.resolve(item).then((res) => { 
                result[index] = res; 
                total++; 
                if (total === values.length) 
                    resolve(result); 
            }). 
                catch((err) => { 
                    reject(err); 
                }) 
        }) 
    }) 
    return promise 
} 

Promise.myall([ 
    prom1, 
    prom2, 
    prom3 
]) 
    .then((res) => { 
        console.log(res); 
    }) 
    .catch((er) => { 
        console.log(er) 
    }) 

Promise.myall([ 
    prom1, 
    prom3, 
    prom4 
]) 
    .then((res) => { 
        console.log(res); 
    }) 
    .catch((er) => { 
        console.log(er) 
    })