57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// 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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s "github.com/inancgumus/prettyslice"
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)
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func main() {
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// 1. slicing creates a new slice
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nums := []int{1, 3, 5, 2, 4, 8}
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odds := nums[:3]
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evens := nums[3:]
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// 2. backing array is shared
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nums[1], nums[3] = 9, 6
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s.Show("nums", nums)
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s.Show("odds : nums[:3]", odds)
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s.Show("evens: nums[3:]", evens)
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// 3. you can create a new slice from an array
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heyArr := [3]byte{'h', 'e', 'y'}
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hey, he := heyArr[:], heyArr[:2]
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// 4. sliced array will be shared among the slices
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heyArr[0] = 'm'
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s.Show("hey := heyArr[:]", hey)
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s.Show("he := heyArr[:2]", he)
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// 5. index expression returns a value
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// while a slice expression returns a slice
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s.Show("nums[0]", nums[0])
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s.Show("nums[0:1]", nums[0:1])
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fmt.Printf("nums[0] : %T\n", nums[0]) // just int
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fmt.Printf("nums[0:1]: %T\n", nums[0:1]) // []int slice
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// 6. extending a slice up to its capacity
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first := nums[0:1]
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s.Show("first := nums[0:1]", first)
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s.Show("first[0:2]", first[0:2])
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s.Show("first[0:3]", first[0:3])
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s.Show("first[0:4]", first[0:4])
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s.Show("first[0:5]", first[0:5])
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s.Show("first[0:6]", first[0:6])
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// s.Show("first[0:7]", first[0:7]) // <- you can't
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first = append(first[0:6], 9)
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s.Show("first: with a new backing array", first)
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}
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