EvalExample1.scala

object EvalExample1 extends App {
    
    val eager = Eval.now {
        println("Hey !! I am eager eval")
        "Hello Eval Eager"
    }
    
    val lazyEval = Eval.later {
        println("Hey !! I am lazy eval")
        "Hello Eval Lazy"
    }
    
    val always = Eval.always {
        println("Hey !! I am always eval")
        "Hello Eval Always"
    }
    
    println(s"Eval Eager: ${eager}")
    println(s"Eval Eager 1: ${eager.value}")
    println(s"Eval Eager 2: ${eager.value}")
    println(s"Eval Lazy: ${lazyEval}")
    println(s"Eval Lazy 1: ${lazyEval.value}")
    println(s"Eval Lazy 2: ${lazyEval.value}")
    println(s"Eval Always: ${always}")
    println(s"Eval Always 1: ${always.value}")
    println(s"Eval Always 2: ${always.value}")
}

/* OUTPUT
Hey !! I am eager eval
Eval Eager: Now(Hello Eval Eager)
Eval Eager 1: Hello Eval Eager
Eval Eager 2: Hello Eval Eager
Eval Lazy: cats.Later@61a485d2
Hey !! I am lazy eval
Eval Lazy 1: Hello Eval Lazy
Eval Lazy 2: Hello Eval Lazy
Eval Always: cats.Always@39fb3ab6
Hey !! I am always eval
Eval Always 1: Hello Eval Always
Hey !! I am always eval
Eval Always 2: Hello Eval Always
*/