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// Copyright 2019 Google LLC
//
// 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
//
// https://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 tips contains tips for writing Cloud Functions in Go.
package tips
import (
"fmt"
"net/http"
)
// [START functions_tips_scopes]
// [START run_tips_global_scope]
// h is in the global (instance-wide) scope.
var h string
// init runs during package initialization. So, this will only run during an
// an instance's cold start.
func init() {
h = heavyComputation()
}
// ScopeDemo is an example of using globally and locally
// scoped variables in a function.
func ScopeDemo(w http.ResponseWriter, r *http.Request) {
l := lightComputation()
fmt.Fprintf(w, "Global: %q, Local: %q", h, l)
}
// [END run_tips_global_scope]
// [END functions_tips_scopes]
func heavyComputation() string {
// Do something slow.
return "slow"
}
func lightComputation() string {
// Do something fast.
return "fast"
}
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