What's the difference in `this` binding between standard function expressions and arrow function expressions?
The key difference is that arrow functions don't have their own `this` binding and instead inherit `this` from the surrounding lexical context (the enclosing function or global scope). Standard function expressions create their own `this` binding, which is determined by how the function is called (the call site). This difference makes arrow functions particularly useful for callbacks and methods that need to access `this` from their parent scope, as they don't lose the context. For example, in a method with a callback like `setTimeout`, using an arrow function will preserve the `this` value from the method, whereas a standard function would have its own `this` (typically the global object or undefined in strict mode). This behavior of arrow functions eliminates common issues with `this` in JavaScript and reduces the need for workarounds like `var self = this` or `Function.prototype.bind()`.