How to check if value exists in this JavaScript array?

Question

I have a JavaScript array, where each new item added to the array gets the next incremental number. An example would be as follows (I hope Im writing this correctly):

<

Answer 1

You can use the relatively new Array.prototype.some() to find whether an item exists (a shim is provided in the documentation):

var ArrayofPeople = [];
ArrayofPeople[0] = [{"id": "529", "name": "Bob"}];
ArrayofPeople[1] = [{"id": "820", "name": "Dave"}];
ArrayofPeople[2] = [{"id": "235", "name": "John"}];

function in_array(array, id) 
{
    return array.some(function(item) {
        return item[0].id === id;
    });
}

console.log(in_array(ArrayofPeople, '820')); // true