Javascript mach coordinates between arrays

Question

I have 3 arrays in Javascript :

var arr1 = [[34.086586, -84.52345500000001], [34.080705, -84.52081499999997], [34.136911, -83.97300999999999], [34.090184, -84.51971000000003], [33.99105, -83.717806]];
var arr2 = [[34.29712, -83.86256700000001]];
var arr3 = [[33.99105, -83.717806]];

How can I check if arr2 or arr3 are inside arr1 ?

Thanks

See http://stackoverflow.com/questions/7837456/how-to-compare-arrays-in-javascript/14853974#14853974 for how to compare two arrays. Then just loop through `arr1`, comparing the elements to `arr2[0]` and `arr3[0]`. — Barmar, Jun 04 '16 at 10:17
Did you understand my question? I don't want to campare arrays, I want to see if the values in arr2 or arr3 are inside arr1. — oussama kamal, Jun 04 '16 at 10:22
That's what I understood. When you loop through `arr1` the elements are arrays like `[34.086586, -84.52345500000001]`. You compare this to `[34.29712, -83.86256700000001]` to see if it matches `arr2`. — Barmar, Jun 04 '16 at 10:23

Nina Scholz · Accepted Answer · 2016-06-04T11:58:59.667

You could iterate over the haystack and the needles and if the length of the arrays inside is equal, check every value.

function check(haystack, needles) {
    return haystack.some(function (h) {
        return needles.some(function (n) {
            return h.length === n.length && h.every(function (a, i) {
                return a === n[i];
            });
        });
    });
}

var arr1 = [[34.086586, -84.52345500000001], [34.080705, -84.52081499999997], [34.136911, -83.97300999999999], [34.090184, -84.51971000000003], [33.99105, -83.717806]],
    arr2 = [[34.29712, -83.86256700000001]],
    arr3 = [[33.99105, -83.717806]];

console.log(check(arr1, arr2));
console.log(check(arr1, arr3));

Perfect, thanks, it is better than the compare arrays suggested below. — oussama kamal, Jun 04 '16 at 11:44

Javascript mach coordinates between arrays

1 Answers1