Edit in JSFiddle

var isAboveTen = function(element, index, array){ //show all arguments passed
    return element >= 10;
};

array1 = [4,43,14,3,14,31,44321];
array2 = [432,43,4321,43,121,314,31,10,31,88];

//is array1 contain all numbers that are equal or above 10
console.log(array1.every(isAboveTen)); //logs false

//is array2 contain all numbers that are equal or above 10
console.log(array2.every(isAboveTen)); //logs true