HTTP response status codes
HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Responses are grouped into five classes:
ADVANCE FUNCTIONS JS
A function has access to the variable environment (VE) of excecution context it was created Closure : VE attached to the function, exactly as it was at the time and place the function was created A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function's scope from an inner function. In JavaScript, closures are created every time a function is created, at function creation time. A closure is the closed-over variable environment of the execution context in which a function wascreated, even after that execution context is gone. A closure gives a function access to all the variables of its parent function , even after that parent function has returned. The function keeps a reference to its outer scope, which preserves the scope chain throught time. A closure makes sure that a function doesn't loose connection to variable that...
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