js/OverlayScrollbars.js
function(arr) {
                var def = Array.isArray;
                return def ? def(arr) : this.type(arr) == TYPES.a;
            }
function(arr) {
                var def = Array.isArray;
                return def ? def(arr) : this.type(arr) == TYPES.a;
            }
function ( arr ) { var def = Array . isArray ; return def ? def ( arr ) : this . type ( arr ) == TYPES . a ; }
Returns true if the given value is a array.
@param arr The potential array.
@returns {boolean} True if the given value is a array, false otherwise.
Returns true if the given value is a array .