add: slice internals last lectures
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54
16-slices/11-slice-internals-4-append/2-example/main.go
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54
16-slices/11-slice-internals-4-append/2-example/main.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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s "github.com/inancgumus/prettyslice"
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)
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func main() {
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s.PrintBacking = true
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// #1: a nil slice has no backing array
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var nums []int
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s.Show("no backing array", nums)
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// #2: creates a new backing array
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nums = append(nums, 1, 3)
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s.Show("allocates", nums)
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// #3: creates a new backing array
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nums = append(nums, 2)
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s.Show("free capacity", nums)
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// #4: uses the same backing array
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nums = append(nums, 4)
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s.Show("no allocation", nums)
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// GOAL: append new odd numbers in the middle
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// [1 3 2 4] -> [1 3 7 9 2 4]
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// #6: [1 3 2 4] -> [1 3 2 4 2 4]
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nums = append(nums, nums[2:]...)
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s.Show("nums <- nums[2:]", nums)
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// #5: overwrites: [1 3 2 4 2 4] -> [1 3 7 9]
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nums = append(nums[:2], 7, 9)
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s.Show("nums[:2] <- 7, 9", nums)
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// #7: [1 3 7 9] -> [1 3 7 9 2 4]
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nums = nums[:6]
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s.Show("nums: extend", nums)
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}
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// don't mind about these options
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// they're just for printing the slices nicely
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func init() {
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s.MaxPerLine = 10
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s.Width = 45
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}
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