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 stackoverflow.com/questions/7837456/… for how to compare two arrays. Then just loop through arr1, comparing the elements to arr2[0] and arr3[0]. — Barmar
– Barmar, Commented Jun 4, 2016 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
– oussama kamal, Commented Jun 4, 2016 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
– Barmar, Commented Jun 4, 2016 at 10:23

Nina Scholz · Accepted Answer · 2016-06-04 11:58:59Z

2

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));

edited Jun 4, 2016 at 11:58

answered Jun 4, 2016 at 11:38

Nina Scholz

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1 Comment

oussama kamal Over a year ago

Perfect, thanks, it is better than the compare arrays suggested below.

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