Elm Language Debugging
Syntax
- Debug.log "tag" anyValue
Remarks
Debug.log takes two parameters, a String to tag the debug output in the console (so you know where it's coming from / what the message corresponds to), and a value of any type. Debug.log executes the side-effect of logging the tag and the value to the JavaScript console, and then returns the value. The implementation in JS might look something like:
function log (tag, value){
console.log(tag, value);
return value
}
JavaScript has implicit conversions, so value doesn't have to be explicitly converted to a String for the above code to work. However, Elm types must be explicitly converted to a String, and the Native code for Debug.log shows this in action.
