Binding a promise handler function to an object

Question

I have some code like:

var bar = foo().then(function success(value) {
  // compute something from a value...
}, function failure(reason) {
  // handle an err         


        

Answer 1

You currently have an anonymous (although labelled) function for your failure callback:

function failure(reason) {
   // handle an error...
}

As robertklep says, you can immediately call .bind on that anonymous function. However, it might be more readable to use a named function instead, and pass it into .then() as a variable:

function success(value) {
    // compute something from a value...
}
function failure(reason) {
    // handle an error...
}
var bar = foo().then(success, failure.bind(this));