Message from JavaScript discussions
September 2018
— What is callback. Fonction ??
A callback is a function you pass as a parameter to another function which will call your callback function after it's done
— Or after some condition
— But why do that ?
— Why i need to pass a fonction like a parameter for other function ??
— For asynchronous functions where you don't control when the function is done, you can pass the callback, and it will be called when it's done
—
asyncFunction(param1, param2, callback)
// someOtherStuff...
asyncFunction is called, but you don't wait for it to complete. someOtherStuff continues to happen, and whenever asyncFunction is done running, it will call callback which is also a function
— Does that make sense Adan?
— Thank you
— No, querySelectorAll obviously does more work
— ?
— Where is the test?