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What is Map() Method? explain with with examples

Hi Guys,

In this blog we are going to learn about map() method in JavaScript with detail understanding and examples.

Map() :- 

The map() method is one of the most critical tools in JavaScript programming. Its objective is to apply a function to every element present in an array, resulting in a new collection of effects. The method is highly valued by developers, and in this piece, we will investigate this method, delve into its mechanics, explore its syntax, and provide practical examples.

The new array containing results is generated by calling the map() method on an array with a callback function applied to each element. The callback function can be passed as an argument and is executed during the process.

For the map() method, the syntax is established as follows:


When using the map() method, the the current element being processed, the array that the method was called on, and the index of the current element are passed as arguments to the callback function. It is also possible to use the thisArg parameter to set the value of this during the callback function's execution.

How It Works?

Iterating over every element in the array, the map() function operates by implementing the callback function in order to generate new elements. The resultant of every function call is then held in a novel array, which is delivered at the end of the iteration.

Works how the map() method illustrates following the example:


The callback function multiplies each element by 2 when the map() method is called on the numbers array in this instance. The array containing the new values, doubledNumbers, are [4, 8, 12, 16, 20].


Examples

Explore more examples, let's, of how the method map() can be used.




The name property of each object in an array of users is extracted using the map() method in Example 2. Meanwhile, Example 1 employs the map() method to convert an array of Celsius temperatures to a corresponding array of Fahrenheit temperatures.


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