JavaScript Callbacks

• Examples
  • setTimeout
• ES6
  • Best practices
    • Prefer arrow functions as callbacks

Examples

setTimeout

setTimeout(() => {  console.log("This will echo after 2 seconds!"); }, 2000);

ES6

Best practices

Prefer arrow functions as callbacks

As callbacks, [JavaScript arrow functions](JavaScript arrow functions) have two advantages over traditional functions:

• ~this~ is lexical and therefore safer to use.
• Their syntax is more compact. That matters especially in functional programming, where there are many higher-order functions and methods (functions and methods whose parameters are functions).