debasishg

Can we do it with `ClassTag` ?

Adriaan: 
You can't with a class tag, as it represents the erased type as known to the JVM. You could use a TypeTag 
to reify the full type, but that depends on full scala reflection, which has its own downsides 
(not thread safe, basically pulls in the compiler,...)

scala> import scala.reflect.runtime.universe.TypeTag
import scala.reflect.runtime.universe.TypeTag

debasishg

trait Coercible[A, B] {
  def coerce(a: A): B
}

def coerce[A, B](a: A)(implicit coerceAB: Coercible[A, B]): B = {
  coerceAB.coerce(a)
}

trait Newtype[+T] {
  val value: T

debasishg

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

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# start postgresql
pg_ctl -D /usr/local/var/postgres start

# stop postgresql
pg_ctl -D /usr/local/var/postgres stop

debasishg

import Control.Monad

-------------------------------------------------------------------------------
-- State Monad Implementation
-------------------------------------------------------------------------------

newtype State s a = State { runState :: s -> (a,s) }

instance Monad (State s) where
  return a = State $ \s -> (a, s)

debasishg

"""
Given a dictionary, transform it to a string. Then byte encode that string. Then base64 encode it and since this will go
on a url, use the urlsafe version. Then decode the byte string so that it can be else where.
"""
data = base64.urlsafe_b64encode(json.dumps({'a': 123}).encode()).decode()

# And the decode is just as simple...
data = json.loads(base64.urlsafe_b64decode(query_param.encode()).decode())
# Byte encode the string, base64 decode that, then byte decode, finally transform it to a dictionary

debasishg

package org.example;

import scala.Function1;
import scala.collection.generic.CanBuildFrom;
import scala.collection.immutable.List;
import scala.collection.immutable.List$;
import scala.collection.immutable.Vector;
import scala.collection.immutable.Vector$;
import scala.collection.mutable.Builder;

debasishg

type Valid[M[_], A] = EitherT[M, AccountServiceException, A]
type AccountOperation[M[_], A] = Kleisli[Valid[M, ?], AccountRepository[M], A]

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debasishg

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