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map(function, iterable, ...) Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel.
If one iterable is shorter than another it is assumed to be extended with None items.
If function is None, the identity function is assumed; if there are multiple arguments, map() returns a list consisting of tuples containing the corresponding items from all iterables (a kind of transpose operation).
The iterable arguments may be a sequence or any iterable object; the result is always a list.
What role does this play in making a Cartesian product?
content = map(tuple, array) What effect does putting a tuple anywhere in there have? I also noticed that without the map function the output is abc and with it, it's a, b, c.
I want to fully understand this function. The reference definitions is also hard to understand. Too much fancy fluff.
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map() creates a new array from calling a function for every array element. map() calls a function once for each element in an array. map() does not execute the function for empty elements. map() does not change the original array.
The map() method in JavaScript creates an array by calling a specific function on each element present in the parent array. It is a non-mutating method. Generally map() method is used to iterate over an array and calling function on every element of array.
keys() method is used to extract the keys from a given map object and return the iterator object of keys. The keys are returned in the order they were inserted. Syntax: Map.keys() Parameters: This method does not accept any parameters. Returns: This returns the iterator object that contains keys in the map.
Map is a collection of elements where each element is stored as a Key, value pair. Map object can hold both objects and primitive values as either key or value. When we iterate over the map object it returns the key, value pair in the same order as inserted.
map isn't particularly pythonic. I would recommend using list comprehensions instead:
map(f, iterable) is basically equivalent to:
[f(x) for x in iterable] map on its own can't do a Cartesian product, because the length of its output list is always the same as its input list. You can trivially do a Cartesian product with a list comprehension though:
[(a, b) for a in iterable_a for b in iterable_b] The syntax is a little confusing -- that's basically equivalent to:
result = [] for a in iterable_a: for b in iterable_b: result.append((a, b)) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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