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In case it is useful for someone, in the context of this challenge, a valid function is that which for a given input, ALWAYS gives the same output.
VALID Function
Given a function f() that functions as:
f(1)=1f(2)=2f(3)=3f(2)=2f(4)=1000
It is considered VALID, as outputs are always in a 1:1 relation with inputs, even although we don't know the exact way the relationship (function) works (i.e. we got no idea how f(4) gives 1000).
INVALID Function
A function g() which functions as follows:
g(1)=1g(2)=333g(3)=89g(2)=777g(4)=1000
The above function g, is NOT VALID, since, for input 2, we get two different results, first 333, then later we get 777.
NOTE : It is worth noting that multiple inputs may give the same output:
f(1)=99f(2)=99f(3)=99
Would still be a valid function.
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Functions or Not?
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Might be helpful to know ...
In case it is useful for someone, in the context of this challenge, a valid function is that which for a given input, ALWAYS gives the same output.
VALID Function
Given a
function f()that functions as:It is considered VALID, as outputs are always in a 1:1 relation with inputs, even although we don't know the exact way the relationship (function) works (i.e. we got no idea how f(4) gives 1000).
INVALID Function
A
function g()which functions as follows:The above function g, is NOT VALID, since, for input 2, we get two different results, first 333, then later we get 777.
NOTE : It is worth noting that multiple inputs may give the same output:
Would still be a valid function.