slice operation

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a[i] = a[len(a)-1]
a[len(a)-1] = nil // zero value, nil、0 etc.
a = a[:len(a)-1]

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copy(a[i:],a[i+1:])
a[len(a)-1] = nil // zero value
a = a[:len(a)-1]

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a = append(a, nil)
copy(a[i+1:],a[i:])
a[i] = x

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a = append(a, x)
x, a = a[len(a)-1], a[:len(a)-1]

a = append([]T{x},a...)
a = a[0], a[1:]

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a := []string{"A", "B", "C", "D", "E"}
i := 2
a[i] = a[len(a)-1]
a[len(a)-1] = "" // zero value, nil、0 ect.
a = a[:len(a)-1]
fmt.Println(a)

a = []string{"A", "B", "C", "D", "E"}
copy(a[i:], a[i+1:])
a[len(a)-1] = "" // zero value
a = a[:len(a)-1]
fmt.Println(a)

a = []string{"A", "B", "C", "D", "E"}
a = append(a, "")
copy(a[i+1:], a[i:])
a[i] = "F"
fmt.Println(a)

// Push Front
a = []string{"A", "B", "C", "D", "E"}
a = append([]string{"F"}, a...)
fmt.Println(a)