In functional programming, a pure function is a function that always produces the same output for the same input and has no side effects. It doesn't modify any external state or rely on mutable data.

Pure functions. The ideal in functional programming is what is known as pure functions.A pure function is one whose results are dependent only upon the input parameters, and whose operation ...

Not all functional programming functions need to be pure. As Functional Programming: Pure Functions explains, it is possible (and sometimes desirable) to “separate the pure, ...

Function is a relation that maps input value to output. Provided with certain value of input, it returns the output considering the mapping. For example a function that doubles the value will map the ...

The function changeGPAs() would take in the students’ array. It would then call changeGPA() for each value in the students array, and return the result as a new array. The job of changeGPA() is to ...

Pure functions have several advantages over impure functions. First, they are easier to reason about, since you only need to consider the input and output, not the context or history of the program.