Elm 0.19 changed the signatures of toInt
and toFloat
.
toInt : String -> Result String Basics.Int
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
toFloat : String -> Result String Basics.Float
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