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landing/docs/Bash-Scripts/008-bash-arrays.md

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+# Arrays
+
+Arrays are essential. They let a single variable hold multiple values. Initialize them by listing values, separated by spaces, inside parentheses:
+
+```bash
+# Example initialization:
+my_array=("value 1" "value 2" "value 3" "value 4")
+```
+
+Access array elements using their numeric index. **Always use curly brackets.**
+
+Let's create `arrays.sh` to demonstrate:
+
+```bash
+touch arrays.sh
+```
+
+Now, open `arrays.sh` and add:
+
+```bash
+#!/usr/bin/env bash
+
+my_array=("value 1" "value 2" "value 3" "value 4")
+
+echo "Second element (index 1): ${my_array[1]}"
+echo "Last element (index -1): ${my_array[-1]}"
+echo "All elements: ${my_array[@]}"
+echo "Total elements: ${#my_array[@]}"
+```
+
+Save and exit. Make it executable:
+
+```bash
+chmod +x arrays.sh
+```
+
+Run your script:
+
+```bash
+./arrays.sh
+```
+
+Output:
+
+```
+value 2
+value 4
+value 1 value 2 value 3 value 4
+4
+```
+
+### Slicing
+
+Extract specific portions of an array or string using slicing notation.
+
+Create `slicing.sh`:
+
+```bash
+touch slicing.sh
+```
+
+Open `slicing.sh` and add these examples:
+
+```bash
+#!/usr/bin/env bash
+
+letters=("A" "B" "C" "D" "E")
+
+echo "Original array: ${letters[@]}"
+
+echo "Example 1 (start 0, length 2): ${letters:0:2}" # Prints AB
+echo "Example 2 (start 0, all elements): ${letters::5}" # Prints ABCDE
+echo "Example 3 (start 3, to end): ${letters:3}" # Prints DE
+```
+
+Save and exit. Make it executable:
+
+```bash
+chmod +x slicing.sh
+```
+
+Run `slicing.sh`:
+
+```bash
+./slicing.sh
+```
+
+Output:
+
+```
+A B C D E
+AB
+ABCDE
+DE
+```
+
+Mastering arrays and slicing gives you precise control over your data structures.