Conditionals

Evaluating Boolean Expressions

Boolean expressions come in many forms in Cocolang, such as

A comparison expression with valid comparison operators like <, >, ==, <= or >=. See Conditionals.DoIfLarge()
An inversion with the ! operator. See BoolClass.Underage()
A class that implements the __bool__ special method can be used directly or converted with Bool(x). See BoolClass.Overage()

If/Else Conditionals

Conditionals in Coco begin with the if statement which can be used for optional execution of a block if the condition is met. The conditional expression must evaluate to a boolean as specified above. Alternate paths to the condition matching can be specified with the else and else if keywords

Ternary Operators

Syntax: result = (true_value if condition else false_value) Can have nested expression in true val and false val.

Switch Conditionals

switch statements are not currently supported yet in cocolang v0.5.2

coco Conditionals

endpoint invoke DoIf(confirm Bool) -> (out String):
    if confirm:
        return (out: {res} <- do())

endpoint invoke DoIfLarge(number U64) -> (out String):
    if number > 5000:
        return (out: {res}<- do())
		else if number > 2500:
				 return (out: "almost")
		else:
			 	 return (out: "not done")
			
func do() -> (res String):
    yield res "done!"

coco BoolClass

class Person:
	field name String
	field age  U64

	method __bool__(self) -> (result Bool):
			yield result self.age > 18

endpoint local Overage(person Person) -> (ok Bool):
			yield ok Bool(person)

endpoint local Underage(person Person) -> (ok Bool):
			yield ok !person

coco ternary

endpoint invoke Basic(v U64) -> (out U64):
    out = (v if v < 10 else v * 10)