2024.01.04
Array.prototype.forAsyncEach = async function (callback) {
for (let i = 0; i < this.length; i++) {
this[i] = await callback(this[i], i, this);
if (i == this.length-1) {
return this
}
}
};
async function start() {
const arr = [1, 2, 3, 4, 5];
await arr.forAsyncEach(async (element, index, array) => {
return await new Promise(resolve => setTimeout(resolve(element * 2), 1000));
}).then(ok=>console.log(ok)/* [ 2, 4, 6, 8, 10 ] */)
console.log('arr', arr) /* [ 2, 4, 6, 8, 10 ] */
}
start()
