analytics.js
function unique(arr) {
  var ret = [];

  for (var i = 0; i < arr.length; i++) {
    if (~ret.indexOf(arr[i])) continue;
    ret.push(arr[i]);
  }

  return ret;
}
function unique(arr) {
  var ret = [];

  for (var i = 0; i < arr.length; i++) {
    if (~ret.indexOf(arr[i])) continue;
    ret.push(arr[i]);
  }

  return ret;
}
function unique ( arr ) { var ret = [ ] ; for ( var i = 0 ; i < arr . length ; i ++ ) { if ( ~ ret . indexOf ( arr [ i ] ) ) continue ; ret . push ( arr [ i ] ) ; } return ret ; }
Return unique array.

@param {Array} arr
@return {Array}
@api private
Return unique array .