How to iterate a json array nullsafe?

Question

I have a json array that I want to iterate as follows:

offer.products.forEach(function(product) {
   console.log(product);
});

Problem: if products list is null or empty or undefined, this will produce an error.

Question: how is safe iterations done properly in javascript?

Answer 1

Try this one

(offer.products || []).forEach(function(product) {
   console.log(product);
});

Answer 2

Just add the fitting checks:

if (offer.products) { //blocks products==null and products==undefined
    offer.products.forEach(function(product) {
        console.log(product);
    });
}

Empty should not be a problem, since forEach should not do anything if products is empty.