The ruby equivalent, which isn’t idiomatic, would be: def my_callback(a, b, c, status_code) puts “did stuff with #{a}, #{b}, #{c} and got #{status_code}” end def do_stuff(a, b, c, callback) sum = a + b + c callback.call(a, b, c, sum) end def main a = 1 b = 2 c = 3 do_stuff(a, b, c, … Read more
The two options are equivalent. However, the promise-style interface (.fail() and .done()) allow you to separate the code creating the request from the code handling the response. You can write a function that sends an AJAX request and returns the jqXHR object, and then call that function elsewhere and add a handler. When combined with … Read more
Return a promise from the then handler that waits: .then(() => new Promise(resolve => setTimeout(resolve, 1000))) If you want to “pass through” the value of the promise, then .then(x => new Promise(resolve => setTimeout(() => resolve(x), 1000))) To avoid this boilerplate everywhere, write a utility function: function sleeper(ms) { return function(x) { return new Promise(resolve … Read more
Just execute the callback in the plugin: $.fn.myPlugin = function(options, callback) { if (typeof callback == ‘function’) { // make sure the callback is a function callback.call(this); // brings the scope to the callback } }; You can also have the callback in the options object: $.fn.myPlugin = function() { // extend the options from … Read more
There are two different ways to configure this behavior in Dart Set a per request timeout You can set a timeout on any Future using the Future.timeout method. This will short-circuit after the given duration has elapsed by throwing a TimeoutException. try { final request = await client.get(…); final response = await request.close() .timeout(const Duration(seconds: … Read more
How about: >>> any(isinstance(e, int) and e > 0 for e in [1,2,’joe’]) True It also works with all() of course: >>> all(isinstance(e, int) and e > 0 for e in [1,2,’joe’]) False
I got an official answer from one of the jQuery developers: $().ready(fn) only works because $() used to be a shortcut to $(document) (jQuery <1.4) So $().ready(fn) was a readable code. But people used to do things like $().mouseover() and all sorts of other madness. and people had to do $([]) to get an empty … Read more
You can raise an exception which you then catch. Rails wraps deletes in a transaction, which helps matters. For example: class Booking < ActiveRecord::Base has_many :booking_payments …. def destroy raise “Cannot delete booking with payments” unless booking_payments.count == 0 # … ok, go ahead and destroy super end end Alternatively you can use the before_destroy … Read more
You almost got it right. However there is one major difference between after_commit and after_create or after_save i.e. In the case of after_create, this will always be before the call to save (or create) returns. Rails wraps every save inside a transaction and the before/after create callbacks run inside that transaction (a consequence of this … Read more
Yup. Function references are just like any other object reference, you can pass them around to your heart’s content. Here’s a more concrete example: function foo() { console.log(“Hello from foo!”); } function caller(f) { // Call the given function f(); } function indirectCaller(f) { // Call `caller`, who will in turn call `f` caller(f); } … Read more