Javascript Map Callback Function
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Javascript Map Callback Function
The value of the element, the index of the element, and the array object being mapped. The callback function gets called inside the main function. The grouptomap() method executes callbackfn once for each index of the array.
Passing the function as an argument is a powerful programming concept that can be used to notify a caller that something happened. This method accepts five parameters as mentioned above and described below: Callback functions used to be very common in javascript and node applications.
Delete() removes a map element specified by the key:
Map () creates a new array from calling a function for every array element. Here, we pass callback() into settimeout() as a parameter. A javascript function can accept another function as an argument. When to use a callback?
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