Python

def func(x):
    if x>=3:
        return x
y = filter(func, (1,2,3,4))  
print(y)
print(list(y))

def function(a):
    return a*a
x = map(function, (1,2,3,4))  #x is the map object
print(x)
print(set(x))

{16, 1, 4, 9}

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