Definition - What does Type Inference mean?
Techopedia explains Type Inference
The inference algorithm tries to determine the argument types as well as the return value type and then it tries to find the most specific data type that works with all of the arguments. As a basic example, consider the function Foo(a,b) = x + y; the compiler knows that the "+" operator takes two integers and also returns an integer, so now the compiler or interpreter can infer that Foo also has the type integer.
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