// Copyright (c) 2023 IBM Corp. // All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package ioeither import ( "fmt" "log" F "github.com/IBM/fp-go/function" IO "github.com/IBM/fp-go/io" T "github.com/IBM/fp-go/tuple" ) func ExampleIOEither_do() { foo := Of[error]("foo") bar := Of[error](1) // quux consumes the state of three bindings and returns an [IO] instead of an [IOEither] quux := func(t T.Tuple3[string, int, string]) IO.IO[any] { return IO.FromImpure(func() { log.Printf("t1: %s, t2: %d, t3: %s", t.F1, t.F2, t.F3) }) } transform := func(t T.Tuple3[string, int, string]) int { return len(t.F1) + t.F2 + len(t.F3) } b := F.Pipe5( foo, BindTo[error](T.Of[string]), ApS(T.Push1[string, int], bar), Bind(T.Push2[string, int, string], func(t T.Tuple2[string, int]) IOEither[error, string] { return Of[error](fmt.Sprintf("%s%d", t.F1, t.F2)) }), ChainFirstIOK[error](quux), Map[error](transform), ) fmt.Println(b()) // Output: // Right[, int](8) }