JavaScript constructor is designed to monitor any changes to this variable

I'm currently working on a JavaScript project and I need to be able to dynamically track changes in an object that is passed into my function.

Although I attempted to utilize Proxy objects for this purpose, I couldn't achieve the desired outcome. One approach I considered was referencing Listening for variable changes in JavaScript

Below is a simplified version of the constructor I am using:

function Fluid(options) {
    this.options = options;
    // Here I want to reactively monitor any changes in 'this.options' and trigger specific code accordingly.
}

let myApp = new Fluid({
    testValue: 1
});

The expected functionality would resemble something like this:

function Fluid(options) {
    this.options = options;

    function doThings() {
        if(this.options.testValue === 1) {
            console.log("The value is 1");
        } else {
            console.log("The value is not 1");
        }
    }

    doThings();

    // A mechanism to detect changes in the this.options object could be implemented here, triggering the doThings() function upon any modifications.

}

let myApp = new Fluid({
   testValue: 1
});

// Console: The value is 1

myApp.testValue = 2;

// Console: The value is not 1

Answer №1

After experimenting further with Proxy objects, I managed to resolve this issue by implementing the code snippet below:

function Fluid(options) {
    this.options = options;

    let proxyHandler = {
        set: (target, objectKey, value) => {
            console.log(`Setting property "${objectKey}" = "${value}"`);
            return target[objectKey] = value;
        }
    };

    this.options = new Proxy(this.options, proxyHandler);

}

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