Take three elements at a time from array

Question

I have an array composed by nine elements:

var ar = ['a','a','a','a','a','a','a','a','a'];

I need to control three elements at a time by a function that returns a true or false. If the first returns true, the others do not have to execute in order to obtain just one true result.

var one = fun(ar.slice(0, 3));
if (one != false) document.write(one);

var two = fun(ar.slice(3, 6));
if (two != false) document.write(two);

var three = fun(ar.slice(6, 9));
if (three != false) document.write(three);

How can I simplify this process? To avoid the creation of a multiarray.

Thanks !!

Answer 1

You could use an array with the slicing paramters and iterate with Array#some

function fun(array) {
    return array.reduce(function (a, b) { return a + b; }) > 10;
}

var ar = [0, 1, 2, 3, 4, 5, 6, 7, 8];

[0, 3, 6].some(function (a) {
    var result = fun(ar.slice(a, a + 3));
    if (result) {
        console.log(a, result);
        return true;
    }
});