Try to convert a string into an int, failing on improperly formatted strings.

String018.toInt "123" --> Ok 123


String018.toInt "-42" --> Ok -42


String018.toInt "3.1" --> Err "could not convert string '3.1' to an Int"


String018.toInt "31a" --> Err "could not convert string '31a' to an Int"

If you are extracting a number from some raw user input, you will typically want to use Result.withDefault to handle bad data:

Result.withDefault 0 (String018.toInt "42") --> 42


Result.withDefault 0 (String018.toInt "ab") --> 0

Try to convert a string into a float, failing on improperly formatted strings.

String018.toFloat "123" --> Ok 123.0


String018.toFloat "-42" --> Ok -42.0


String018.toFloat "3.1" --> Ok 3.1


String018.toFloat "31a" --> Err "could not convert string '31a' to a Float"

If you are extracting a number from some raw user input, you will typically want to use Result.withDefault to handle bad data:

Result.withDefault 0 (String018.toFloat "42.5") == 42.5


Result.withDefault 0 (String018.toFloat "cats") == 0