How can I validate arrays within objects in JavaScript?

How can I validate arrays within objects in JavaScript?

You can use the Array.isArray() method to check if a property is an array, and then validate its contents.

Can you show me an example of that?

Sure! Here's a simple example:

const obj = { items: [1, 2, 3] };

if (Array.isArray(obj.items)) {
    console.log('Valid array:', obj.items);
} else {
    console.log('Not a valid array.');
}

What if I want to validate the contents of the array as well?

You can use the every() method to check if all elements meet a certain condition. For example:

const obj = { items: [1, 2, 3] };

if (Array.isArray(obj.items) && obj.items.every(item => typeof item === 'number')) {
    console.log('Valid array of numbers:', obj.items);
} else {
    console.log('Invalid array or contains non-number elements.');
}