Is it possible to override JavaScript’s toString() function to provide meaningful output for debugging?

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You can override toString in Javascript as well. See example:

function Foo() {}

// toString override added to prototype of Foo class
Foo.prototype.toString = function() {
  return "[object Foo]";
}

var f = new Foo();
console.log("" + f); // console displays [object Foo]

See this discussion on how to determine object type name in JavaScript.

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