Ejemplo 1: async en espera en forloops
// Series loop
async (items) => {
for (let i = 0; i < items.length; i++) {
// for loop will wait for promise to resolve
const result = await db.get(items[i]);
console.log(result);
}
}
// Parallel loop
async (items) => {
let promises = [];
// all promises will be added to array in order
for (let i = 0; i < items.length; i++) {
promises.push(db.get(items[i]));
}
// Promise.all will await all promises in the array to resolve
// then it will itself resolve to an array of the results.
// results will be in order of the Promises passed,
// regardless of completion order
const results = await Promise.all(promises);
console.log(results);
}
Ejemplo 2: espere a que el bucle finalice javascript
async function processArray(array) {
// map array to promises
const promises = array.map(delayedLog);
// wait until all promises are resolved
await Promise.all(promises);
console.log('Done!');
}
Ejemplo 3: javascript asíncrono en bucle
const forEachLoop = _ => {
console.log('Start')
fruitsToGet.forEach(async fruit => {
const numFruit = await getNumFruit(fruit)
console.log(numFruit)
})
console.log('End')
}
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