75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
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/*
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Slices: https://www.youtube.com/watch?v=CF9S4QZuV30&t=1139s#
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Syntax: 0:3 - a slice capturing the first index up to then 3rd index
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*/
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package main
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import "fmt"
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func main() {
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/*
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A slice is like an array but when you define them
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you leave out the size
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*/
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//define an array without a static size of type 'int' and assign values
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numSlice := []int{5, 4, 3, 2, 1}
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/*
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define a variable containing the pre-created array and
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start at the 3rd index going through the 5th
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(Indexes start at 0 here as well)
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*/
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numSlice2 := numSlice[3:5]
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fmt.Println("numSlice2[0] =", numSlice2[0])
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fmt.Println("numSlice2[1] =", numSlice2[1])
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/*
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If you do not supply the first number before the colon
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the first number will default to index (0)
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the result is everyting before index 2
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*/
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fmt.Println("numSlice[:2] =", numSlice[:2])
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/*
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The opposite is true if you do not supply the second number
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the result is everything after index 2
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*/
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fmt.Println("numSlice[2:] =", numSlice[2:])
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/*
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To create a slice without set values, you need to use 'make'
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If you want index 0 to start at index 5 and set a max
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length of 10:
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*/
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numSlice3 := make([]int, 5, 10)
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/*
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numSlice3 at this point is empty since no values were assigned
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but we can copy the values of numSlice with 'copy'
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*/
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copy(numSlice3, numSlice)
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/*
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Since numSlice3 begins at index 5, index 0 will output the
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5th index of 'numSlice' which was copied into numSlice3
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*/
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fmt.Println("numSlice3[0] =", numSlice3[0])
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fmt.Println("numSlice3[1] =", numSlice3[1])
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/*
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Since we gave numSlice3 a maximum of 10 possible indexes
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we can append more values than the original 'numSlice' variable
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which was only 5 indexes originally
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*/
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//append the values '0', and '-1' to the next available indexes ( 5 and 6)
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numSlice3 = append(numSlice3, 0, -1)
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fmt.Println("numSlice3[5] =", numSlice3[5])
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fmt.Println("numSlice3[6] =", numSlice3[6])
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}
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