i tried

gistfile1.txt

var maxEnvelopes = function(envelopes) {
    var result = [];
  var sorted0 = envelopes.sort((a,b) => {
      return a[0] - b[0];
  });
    var sorted1 = envelopes.sort((a,b) => {
        return a[1] - b[1];
    });
    for (var i = 0; i < sorted0.length; i++) {
        if (compare(sorted0[i],sorted1[i])) {
            result.push(sorted0[i]);
        }
    }
    
    for(var j = 0; j < result.length - 1 ; j++) {
        if (result[j][0] < result[j + 1][0] && result[j][1] <  result[j + 1][1]) {
            continue;
        }  else {
            result.splice(j,1);
            j++;
        }
    }
    return result.length;

};

var compare = function(a,b) {
    return a.every((each, i) => {
        return each === b[i];
    });
}