Texas Instruments Applications Developer Intern interview questions

what is the software engineering life cycle? what is a prototype? what is the difference between verification and validation and other questions related to SDLC. Then there were questions related to OOPS - polymorphism, classes, objects, reference variable, operator overloading, write a code for operator overloading Then as I had written about javascript in my resume, few questions on js were asked like to reverse a string in js and validating email.