58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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)
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func main() {
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// GOALS:
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// 1- String value is immutable
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// 2- Indexing vs Slicing
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// 3- Using bytes for manipulating strings
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mood := "wonder"
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// 1- a string value is immutable (read-only)
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// mood[1] = 'a'
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// 2- Indexing vs Slicing
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// "wonder"
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// ^ ^^^^
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// | ||||
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// "wandering"
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// "w" + "a" + "nder" + "ing"
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// wandering := mood[0] + "a" + mood[2:] + "ing"
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// fmt.Printf("mood[0] : %T - %[1]v\n", mood[0]) // byte
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// fmt.Printf("mood[0:1] : %T - %[1]v\n", mood[0:1]) // string
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// wandering := mood[:1] + "a" + mood[2:] + "ing"
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fmt.Println(mood)
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// fmt.Println(wandering)
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// 3- converting creates a new byte slice (allocation)
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b := []byte(mood)
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b[1] = 'a'
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// b = append(b, 'i', 'n', 'g')
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// b = append(b, []byte{'i', 'n', 'g'})
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b = append(b, "ing"...)
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// starts copying from the first element
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copy(b, "listen")
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// starts copying from the "7th" element
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copy(b[6:], "ed.")
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fmt.Println(string(b))
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}
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