You've learned how to create functions and pass values into them — but functions can also send data...
You've learned how to create functions and pass values into them — but functions can also send data back to wherever they were called from. They do some work, then hand back the result.
Swift has tons of built-in functions that do this. For example sqrt() takes a number and sends back its square root:
let root = sqrt(169)
print(root)
// 13.0
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