There is a misunderstanding, the definition of function is a binary mapping between sets. The interpretation from MDN is strictly related to the world of programming languages where the term function is improperly used to represent any procedure. It is not the meaning used in "functional programming" where functional refers to a classic function. Sometimes in programming we like to add the term "pure" to denote when a function (from the language perspective) is actually a function.
One thing to note is that all of the nice properties of "pure" functions that are leveraged in FP are almost never respected when functions are not "pure" (or better, not functions)
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There is a misunderstanding, the definition of function is a binary mapping between sets. The interpretation from MDN is strictly related to the world of programming languages where the term function is improperly used to represent any procedure. It is not the meaning used in "functional programming" where functional refers to a classic function. Sometimes in programming we like to add the term "pure" to denote when a function (from the language perspective) is actually a function.
One thing to note is that all of the nice properties of "pure" functions that are leveraged in FP are almost never respected when functions are not "pure" (or better, not functions)