A very common programming problem that arises in most languages is a simple function that returns true if an input item is present in an array (or dictionary or slice or a variety of other terms) of items and false if it is not.

Basically, let’s say we had a grouping of items like this:

[cat, dog, bird, turtle, fish, panda]

In my program, I simply want to check if the string gopher exists. In this case, the function I use will return false.

The thing about Go is that this isn’t a standard, out-of-the-box function, so we’ll have to write it ourselves.

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