What are some performance considerations specific to callback usage in back-end applications (e.g., in high-traffic servers)?

The fail callback takes either a string or a JavaScript Error type. The done callback takes an argument specific to each function. Most functions (create, reply ... A callback is a simple function that's passed as a value to another function, and will only be executed when the event happens. The official Router for Vue.js. ... This will also cancel the navigation and call any callback registered via router. A pre-request callback function that can be used to modify the jqXHR (in jQuery 1.4.x, XMLHTTPRequest) object before it is sent. Use this to set custom headers, ... Mar 27, 2025 ... For example, client-side callbacks using JS-SDK are designed ... The merchant may make a Show Order Details API call to get the final ... Jun 18, 2022 ... ... call new functions from the script, we should write that in the callback: loadScript ( '/my/script.js' , function ( ) { // the callback runs ... Mar 4, 2023 ...