How to remove duplicates from a two-dimensional array? [closed]

Answer 1

var origin = [[7,3], [7,3], [3,8], [7,3], [7,3], [1,2]];

function arrayEqual(a, b) {
    if (a.length !== b.length) { return false; }
    for (var i = 0; i < a.length; ++i) {
        if (a[i] !== b[i]) {
            return false;
        }
    }
    return true;
}

function contains(array, item) {
    for (var i = 0; i < array.length; ++i) {
        if (arrayEqual(array[i], item)) {
            return true;
        }
    }
    return false;
}

function normalize(array) {
    var result = [];
    for (var i = 0; i < array.length; ++i) {
        if (!contains(result, array[i])) {
            result.push(array[i]);
        }
    }
    return result;
}

var result = normalize(origin);
console.log(result);

http://jsfiddle.net/2UQH6/