Simple Steps to Using Arrays

1. Choose the Size: First, decide how big your array will be. For example, if you pick a size of $n$, it can hold $n$ items.

2. Set Aside Space: Next, you need to set aside a space in memory for your array. This usually takes a time of $O(n)$.

3. Set Starting Values: Now, give each item in your array a starting value, often zero. This also takes $O(n)$ time.

4. Get Items Quickly: You can grab any item from the array right away. This takes constant time, $O(1)$, because you can find it directly.

Good Things About Arrays:

• Fast to get items.
• Easy to set up.

Not So Good Things About Arrays:

• You can’t change the size once you've chosen it.
• Adding or removing items can take time, up to $O(n)$ when it's at its worst.