Standard Library Utilities

Strings Helpers

The strings package has small helpers for searching, replacing, and changing text.

string helper A string helper is a library function that performs a common text operation.

Strings Helpers

phrase
strings_helpers.go
Replay: real traced execution (multi-file project)
package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "go basics"
	hasGo := strings.Contains(phrase, "go")
	upper := strings.ToUpper(phrase)
	slug := strings.ReplaceAll(phrase, " ", "-")

	fmt.Println("phrase=", phrase)
	fmt.Println("hasGo=", hasGo)
	fmt.Println("upper=", upper)
	fmt.Println("slug=", slug)
}

package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "trace replay"
	hasGo := strings.Contains(phrase, "go")
	upper := strings.ToUpper(phrase)
	slug := strings.ReplaceAll(phrase, " ", "-")

	fmt.Println("phrase=", phrase)
	fmt.Println("hasGo=", hasGo)
	fmt.Println("upper=", upper)
	fmt.Println("slug=", slug)
}

package main

import (
	"fmt"
	"strings"
)

func main() {
	var phrase = "hello go"
	hasGo := strings.Contains(phrase, "go")
	upper := strings.ToUpper(phrase)
	slug := strings.ReplaceAll(phrase, " ", "-")

	fmt.Println("phrase=", phrase)
	fmt.Println("hasGo=", hasGo)
	fmt.Println("upper=", upper)
	fmt.Println("slug=", slug)
}

  1. phrase ← "go basics", hasGo ← true, upper ← "GO BASICS", slug ← "go-basics"

    8func main() {9  var phrase→ "go basics" = "go basics" //@phrase="trace replay", "hello go"10  hasGo→ true := strings.Contains(phrase"go basics", "go")11  upper→ "GO BASICS" := strings.ToUpper(phrase"go basics")12  slug→ "go-basics" := strings.ReplaceAll(phrase"go basics", " ", "-")1314  fmt.Println("phrase=", phrase"go basics")15  fmt.Println("hasGo=", hasGotrue)16  fmt.Println("upper=", upper"GO BASICS")17  fmt.Println("slug=", slug"go-basics")18}
    outputphrase= go basics
hasGo= true
upper= GO BASICS
slug= go-basics

  1. phrase ← "trace replay", hasGo ← false, upper ← "TRACE REPLAY"

    8func main() {9  var phrase→ "trace replay" = "trace replay"10  hasGo→ false := strings.Contains(phrase"trace replay", "go")11  upper→ "TRACE REPLAY" := strings.ToUpper(phrase"trace replay")12  slug→ "trace-replay" := strings.ReplaceAll(phrase"trace replay", " ", "-")1314  fmt.Println("phrase=", phrase"trace replay")15  fmt.Println("hasGo=", hasGofalse)16  fmt.Println("upper=", upper"TRACE REPLAY")17  fmt.Println("slug=", slug"trace-replay")18}
    outputphrase= trace replay
hasGo= false
upper= TRACE REPLAY
slug= trace-replay

  1. phrase ← "hello go", hasGo ← true, upper ← "HELLO GO", slug ← "hello-go"

    8func main() {9  var phrase→ "hello go" = "hello go"10  hasGo→ true := strings.Contains(phrase"hello go", "go")11  upper→ "HELLO GO" := strings.ToUpper(phrase"hello go")12  slug→ "hello-go" := strings.ReplaceAll(phrase"hello go", " ", "-")1314  fmt.Println("phrase=", phrase"hello go")15  fmt.Println("hasGo=", hasGotrue)16  fmt.Println("upper=", upper"HELLO GO")17  fmt.Println("slug=", slug"hello-go")18}
    outputphrase= hello go
hasGo= true
upper= HELLO GO
slug= hello-go