Medium Promise-any examples

Promis-any.js

// Example 1:
const dog = new Promise((resolve, reject) => {
  setTimeout(() => reject('🐶'), 1000)
})
const cat = new Promise((resolve, reject) => {
  setTimeout(() => resolve('🐈'), 2000)
})

Promise.any([dog, cat]).then((value) => {
  // value will be the resolved value of 
 // first promise which resolved.
  console.log(value) // '🐈'
})

// Example 2:
const bear = new Promise((resolve, reject) => {
  setTimeout(() => reject('🐻'), 1000)
})
const panda = new Promise((resolve, reject) => {
  setTimeout(() => reject('🐼'), 2000)
})

Promise.any([bear, panda])
  .then((value) => {
    console.log(value)
  })
  .catch((error) => {
  // Array of rejected values
    console.error(error) // ['🐻','🐼']
  })

// Practical Usage:
// This can be used if we have multiple async calls 
// and we are only interested in the first successful one.
Promise.any([
    fetch('/endpoint'),
    fetch('/alternateEndpoint'),
    })
]).then(response => console.log(response))
.catch(error => console.log(error))