function repeat callback seconds let fn repeat callback seconds let pr

function repeat(callback, seconds) {
  let fn = () => repeat(callback, seconds);
  let promise = Promise.resolve(callback());
  promise
    .catch(err => console.error(err))
    .then(() => setTimeout(fn, seconds * 1000));
}

repeat(function () {
  console.log('example, every 1 seconds');
}, 1)

repeat(function () {
  // example with request
  return fetch('https://api.simpleswap.io/get_min?currency_from=btc&currency_to=eth')
    .then(response => response.json())
    .then(json => console.log(json));
}, 3);