Can I intercept a function called directly?

Question

In this code I created a function called someFunction. Then I modified Function.prototype.apply and call methods. So instead of my function code is working I am running my i

Answer 1

Function.prototype.callWithIntercept = function () {
    alert("intercept");
    return this.apply(null, arguments);
};

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var num = parseInt.callWithIntercept("100px", 10);

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It is worth noting that in newer versions of JS, there are Proxy objects you can use: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy