JavaScript Array map() method in Bangla

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JavaScript Array map() method in bangla.

The `map()` method in JavaScript is used to create a new array by applying a function to each element of an existing array. It doesn't modify the original array but returns a new array with the transformed elements.

Key Points:
1. **Transformation**: Each element of the original array is passed through a callback function that specifies how the element should be transformed. The result of this function becomes the corresponding element in the new array.

2. **Same Length**: The new array created by `map()` will always have the same length as the original array, but the values may differ based on the transformation.

3. **Non-Mutating**: The `map()` method does not change the original array; it creates a new one.

4. **Callback Function**: The function you pass to `map()` receives three arguments:
- The current element being processed.
- The index of the current element.
- The array that `map()` was called upon.

Example Scenario:
Imagine you have an array of numbers and you want to create a new array where each number is doubled. Using `map()`, you would pass a function that multiplies each element by 2, and `map()` would return a new array with the doubled values.


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