Скачать или смотреть Lecture No 29 Advance JavaScript Learn forEach , map URDU/HINDi

prototype.forEach()
The forEach method executes the provided callback once for each key of the map which actually exist. It is not invoked for keys which have been deleted. However, it is executed for values which are present but have the value undefined.

callback is invoked with three arguments:

the entry's value
the entry's key
the Map object being traversed
If a thisArg parameter is provided to forEach, it will be passed to callback when invoked, for use as its this value. Otherwise, the value undefined will be passed for use as its this value. The this value ultimately observable by callback is determined according to the usual rules for determining the this seen by a function.

Each value is visited once, except in the case when it was deleted and re-added before forEach has finished. callback is not invoked for values deleted before being visited. New values added before forEach has finished will be visited.

JavaScript Map forEach() Method

The Map.forEach method is used to loop over the map with the given function and executes the given function over each key-value pair.
Parameters: This method accepts four parameters as mentioned above and described below:

callback: This is the function that executes on each function call.
value: This is the value for each iteration.
key: This is the key to reach iteration.
thisArg: This is the value to use as this when executing callback.

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