Using Traps
Explore how to create and use traps in JavaScript Proxy objects to spy on property access and modify behavior dynamically. Understand the get() trap, how it intercepts property reads, and how to control or alter responses such as restricting access to certain properties.
We'll cover the following...
We'll cover the following...
Creating a trap to spy
The dummy proxy we created in the previous lesson has no traps in its handler. For each method that’s available on Reflect, we can optionally create a trap in the handler. To create a trap to be used when reading an object’s property, add a get() function to the handler.
Arguments in track function
The trap function for get() takes three arguments:
target: This is the same as the first argument we passed to the constructor ofProxy.propertyName: This is the property we are trying to get. For example, if we called