When a javascript Promise object has been fulfilled the function within the then method of that Promise object will get invoked. The below example uses a promise object chain to make the array of elements multiply by themselves and only return those elements that are greater or equal to 16.
let p = new Promise((resolve, reject) => {
try {
let data = [2, 4, 5, 6, 8, 10];
let data_revise = data.map(x => x * x);
resolve(data_revise);
} catch(err) {
reject("error happened " + err);
}
})
p.then((data) => {
return data.filter(x=> x >= 16);
}).then((data) => {
for(let i = 0; i < data.length; i++)
console.log(data[i]);
}).catch(function(error){
console.log(error);
});
As you might have guessed the outcomes are as follows:-
16 25 36 64 100
4 has not been included in the above printout because it is lesser than 16.
