An exception is a generalization of the concept of an error to include any unexpected condition encountered during execution.

Exception Handling-

• try
• catch
• finally
• throw

How does the Javascript callback function work?

A callback function is a function (It can be any function Anonymous Function, Arrow Function) passed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action.

Synchronous – It waits for each operation to complete, after that it executes the next operation.

Asynchronous – It never waits for each operation to complete, rather it executes all operations in the first GO only.

map ( ) Method in JavaScript

The map( ) method creates a new array with the results of calling a provided function on every element in the calling array.
the map calls a provided callback function once for each element in an array, in order, and returns a new array from the results.

Syntax:-
map(callback(currentValue, index, array), thisArg);

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