Function createFnDeferredProxy

Create a deferred proxy function which will call the named function of the result of the hostFn, this enables creating bound functions which when called call the proxy the function to a different host (this) instance.

This is different from fnBind which is provided with the concrete function and this instances, while the proxy will lazily obtain the this and the function is obtained by looking up the named function from the returned host (this) instance.

Since

0.9.8

Example

const module1 = {
    prefix: "Hello",
    x: 21,
    getX() {
        return this.x;
    },
    log(value: string) {
        return this.prefix + " " + value + " : " + this.x
    }
};

// The 'this' parameter of 'getX' is bound to 'module'.
module1.getX(); // 21
module1.log("Darkness"); // Hello Darkness : 21

// Create a new function 'boundGetX' with the 'this' parameter bound to 'module'.
let module2 = {
    prefix: "my",
    x: 42
};

let getHost = () => {
    return module1;
};

let deferredFn = createFnDeferredProxy(getHost, "getX");

deferredFn();   // 21

module2.defX = deferredFn;

module2.defX();  // 21
Copy