Polyfill of map in javascript implementation of array map

a polyfill for the `map` method in javascript provides a way to implement this functionality in environments that do not support it natively. the `map` method is used to create a new array populated with the results of calling a provided function on every element in the original array. the polyfill typically checks if the `map` method already exists on the `array` prototype; if not, it defines the method.

the implementation involves iterating over the array elements, applying the callback function to each element, and pushing the results into a new array. it also accounts for the optional `thisarg` parameter, which allows users to specify the value of `this` within the callback. by using this polyfill, developers can ensure compatibility across older browsers and environments, enabling consistent behavior of the `map` method in their javascript applications.
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