* @return The existing or created verb
*/
private Verb defineVerb(String functionName, Lambda verbDefinition) {
Verb existingVerb = verbs.get(functionName);
if(existingVerb != null){
existingVerb.redefine(verbDefinition);
return existingVerb;
}
VerbImpl createdVerb = VerbImpl.create(functionName, verbDefinition);
verbs.put(functionName, createdVerb);
return createdVerb;