1. What’s relationship between JavaScript and ECMAScript? – ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3.
  2. What are JavaScript types? – Number, String, Boolean, Function, Object, Null, Undefined.
  3. How do you convert numbers between different bases in JavaScript? – Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt ("3F", 16);

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