inAny is a predicate determining whether some property exists in any of its first parameter's elements.

inAny.js

function inAny(a, prop) { 
    return a.some(function (each) { 
        return typeof each[prop] !== 'undefined'; 
    }; 
}


var a = [{}, {}, {found: 0}];

inAny(a, 'found'); // true