decode javascript's map function
Do you know, map function takes couple of parameters.
map(callbackFn, thisArg)
callbackFn: A function to execute for each element in the array. Its return value is added as a single element in the new array. The function is called with the following arguments:
1. element
The current element being processed in the array.
2. index
The index of the current element being processed in the array.
3. array
The array map() was called upon.
thisArg: A value to use as 'this' when executing callbackFn.
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