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What are difference between global and local variables? A variable that is declare outside of a function is a global variable, and its value is accessible and modifiable throughout your program. A variable that is declared inside a function is local. It is created and destroyed every time the function is executed, and it cannot be accessed by any code outside the function. (
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How we define a class in JavaScript? JavaScript does not have a class definition separate from the constructor. Instead, you define a constructor function to create objects with a particular initial set of properties and values. Any JavaScript function can be used as a constructor. You used the new operator with a constructor function to create a new object. (
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What is a JavaScript function? JavaScript function is a block of code that will be executed when it was called by external code. A function begin with the function keyword, followed by the name, list of parameters if any, and a block of codes inside a curly braces. Function can return a value. Arguments are passed to function by a value.
What is a function expression? A function expression is a function defined inside an expression. A function name in function expression can be omitted, in which case the function is anonymous. Example: var foo = function () { return 5; }
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