Infix Functions
Discover what infix functions are and how you can implement your own to write more readable Kotlin code.
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Infix functions are a great tool to improve readability of function calls in certain cases.
What are Infix Functions? #
In programming, function calls are typically written in prefix notation, meaning that the function name is in front, followed by its arguments in parentheses:
gcd(54, 24)
With infix functions, however, the function name stands between the arguments. You’ve already seen this with the predefined to function, which creates Pairs (to put into a map):
"Dwayne" to 3.14159
Here, the function name to is surrounded by its two arguments, which brings us to the first limitation of infix functions: an infix function must have exactly two parameters. In the function call, the first argument is on the left ...