promise-poll

Provides a function which resolves a promise which resolves within a given timeout if its predicate returns something truthy.

Installation

npm install promise-poll

Usage

var poll = require('promise-poll');

poll(rollOddDice, 1000).then(function(roll) {
  console.log('odd dice roll:', roll);
}, function(err) {
    console.error(err);
});

function rollOddDice() {
  var diceRoll = Math.floor(Math.random() * 6) + 1;
  return diceRoll % 2 ? diceRoll : false;
}

API

poll(predicate, timeout[, interval:ms]) : Promise

predicate

a function which returns a truthy values, whose first truthy value will be used to resolve the Promise

timeout

the number of milliseconds to wait before declaring the Promise rejected

interval

the number of milliseconds between attempts to test the predicate