Currying

Currying is a technique to change a function with multiple argument into many functions that each take one argument.

It's more used as a design approach for certain computer science fields. In some langages, function can only have one argument.

def add_function(x,y):
    return x + y

# Currying
def outer_function(x):
    def inner_function(y):
        return x + y
    return inner_function
    
closure = outer_function(10)
print(closure(5)) # Output: 15

NOTE

inner_function remember the value of x even outside the scope. It's a case of closure