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I know that't very silly, but how to start a promise chain? I have, for example,
var p = new Promise(function(resolve,reject) {
setTimeout(function() {
return resolve("Hi from promise after timeout");
},1000);
});
How to run it? It should be like that,
when(p)
.then(function(msg) {
console.log(msg);
})
.catch(function(error) {
console.error(error);
});
But when is not defined.
768
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Promises are basically javascript objects used asynchronously. In a synchronous execution, you don't need states, per se. Your code either successfully execute or fail to execute. In asynchronous code, we execute, wait for callbacks and decide if its success or failure and continue with the synchronous code execution.
It allows you to associate handlers with an asynchronous action's eventual success value or failure reason. This lets asynchronous methods return values like synchronous methods: instead of immediately returning the final value, the asynchronous method returns a promise to supply the value at some point in the future.
You just need to do:
p.then(function(msg) {
console.log(msg);
})
.catch(function(error) {
console.error(error);
});
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