slices tutorial section

golearn/derek_banas_tutorial/Slices/main.go

@@ -0,0 +1,74 @@
+/*
+Slices: https://www.youtube.com/watch?v=CF9S4QZuV30&t=1139s#
+Syntax: 0:3 - a slice capturing the first index up to then 3rd index
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	/*
+		A slice is like an array but when you define them
+		you leave out the size
+	*/
+
+	//define an array without a static size of type 'int' and assign values
+	numSlice := []int{5, 4, 3, 2, 1}
+
+	/*
+		define a variable containing the pre-created array and
+		start at the 3rd index going through the 5th
+		(Indexes start at 0 here as well)
+	*/
+	numSlice2 := numSlice[3:5]
+
+	fmt.Println("numSlice2[0] =", numSlice2[0])
+	fmt.Println("numSlice2[1] =", numSlice2[1])
+
+	/*
+		If you do not supply the first number before the colon
+		the first number will default to index (0)
+		the result is everyting before index 2
+	*/
+	fmt.Println("numSlice[:2] =", numSlice[:2])
+
+	/*
+		The opposite is true if you do not supply the second number
+		the result is everything after index 2
+	*/
+	fmt.Println("numSlice[2:] =", numSlice[2:])
+
+	/*
+		To create a slice without set values, you need to use 'make'
+		If you want index 0 to start at index 5 and set a max
+		length of 10:
+	*/
+
+	numSlice3 := make([]int, 5, 10)
+
+	/*
+		numSlice3 at this point is empty since no values were assigned
+		but we can copy the values of numSlice with 'copy'
+	*/
+	copy(numSlice3, numSlice)
+
+	/*
+		Since numSlice3 begins at index 5, index 0 will output the
+		5th index of 'numSlice' which was copied into numSlice3
+	*/
+	fmt.Println("numSlice3[0] =", numSlice3[0])
+	fmt.Println("numSlice3[1] =", numSlice3[1])
+
+	/*
+		Since we gave numSlice3 a maximum of 10 possible indexes
+		we can append more values than the original 'numSlice' variable
+		which was only 5 indexes originally
+	*/
+
+	//append the values '0', and '-1' to the next available indexes ( 5 and 6)
+	numSlice3 = append(numSlice3, 0, -1)
+
+	fmt.Println("numSlice3[5] =", numSlice3[5])
+	fmt.Println("numSlice3[6] =", numSlice3[6])
+}