Generic array logic

Okay kiddo, let me try to explain generic array logic in a way that you can easily understand.

Do you know what an array is? It's basically a collection or a list of elements. For example, if we have a list of fruits, the array would look like this:

['apple', 'banana', 'orange']

Now, let's say we want to create a function that takes an array of numbers and returns the sum of all the numbers in that array. We can write a function like this:

function sumArray(arr) {
let sum = 0;
for (let i = 0; i < arr.length; i++) {
sum += arr[i];
}
return sum;
}

This function works perfectly fine if we pass it an array of numbers, like this:

sumArray([1, 2, 3, 4, 5]);

But what if we want to use this function for an array of strings, like this:

sumArray(['apple', 'banana', 'orange']);

It won't work, because it's trying to add strings instead of numbers. This is where generic array logic comes in.

We can modify our function to use generic array logic, which means it can work with any type of array, whether it's an array of numbers, strings, or even objects. Here's the modified function:

function sumArray(arr) {
let sum = 0;
for (let i = 0; i < arr.length; i++) {
let value = arr[i];
if (typeof value === 'number') {
sum += value;
}
}
return sum;
}

Now, this function will only add the elements of the array that are of type 'number'. If we pass it an array of strings, it will simply ignore them and return 0.

So, that's what generic array logic is all about. It's a way of writing functions that can work with any type of array, regardless of what the elements are.