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2 ways to delete an element from a slice
source link: https://yourbasic.org/golang/delete-element-slice/
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2 ways to delete an element from a slice
yourbasic.org/golang
Fast version (changes order)
a := []string{"A", "B", "C", "D", "E"}
i := 2
// Remove the element at index i from a.
a[i] = a[len(a)-1] // Copy last element to index i.
a[len(a)-1] = "" // Erase last element (write zero value).
a = a[:len(a)-1] // Truncate slice.
fmt.Println(a) // [A B E D]The code copies a single element and runs in constant time.
Slow version (maintains order)
a := []string{"A", "B", "C", "D", "E"}
i := 2
// Remove the element at index i from a.
copy(a[i:], a[i+1:]) // Shift a[i+1:] left one index.
a[len(a)-1] = "" // Erase last element (write zero value).
a = a[:len(a)-1] // Truncate slice.
fmt.Println(a) // [A B D E]The code copies len(a) - i - 1 elements and runs in linear time.
Further reading
Slices and arrays in 6 easy steps
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