| 110 | } |
| 111 | |
| 112 | func javascriptReduceStats(call otto.FunctionCall) otto.Value { |
| 113 | rere, err := call.Argument(2).ToBoolean() |
| 114 | if err != nil { |
| 115 | return ottoMust(otto.ToValue(fmt.Sprintf("Error getting rere flag: %v", err))) |
| 116 | } |
| 117 | |
| 118 | ob, err := call.Argument(1).Export() |
| 119 | if err != nil { |
| 120 | return ottoMust(otto.ToValue(fmt.Sprintf("Error getting stuff: %v", err))) |
| 121 | } |
| 122 | l, ok := ob.([]interface{}) |
| 123 | if !ok { |
| 124 | return ottoMust(otto.ToValue(fmt.Sprintf("unhandled %v/%T", ob, ob))) |
| 125 | } |
| 126 | |
| 127 | rv := statsResult{} |
| 128 | |
| 129 | if len(l) == 0 { |
| 130 | return rv.toOtto() |
| 131 | } |
| 132 | |
| 133 | if rere { |
| 134 | // Rereduction goes here. |
| 135 | rv.load(l[0]) |
| 136 | for i := 1; i < len(l); i++ { |
| 137 | ob := statsResult{} |
| 138 | ob.load(l[i]) |
| 139 | rv.Add(ob) |
| 140 | } |
| 141 | return rv.toOtto() |
| 142 | } |
| 143 | |
| 144 | // Initial reduction |
| 145 | rv.count = 1 |
| 146 | rv.sum = zeroate(l[0]) |
| 147 | rv.min = rv.sum |
| 148 | rv.max = rv.sum |
| 149 | rv.sumsqr = rv.sum * rv.sum |
| 150 | |
| 151 | for i := 1; i < len(l); i++ { |
| 152 | v := zeroate(l[i]) |
| 153 | rv.count++ |
| 154 | rv.sum += v |
| 155 | rv.min = math.Min(rv.min, v) |
| 156 | rv.max = math.Max(rv.max, v) |
| 157 | rv.sumsqr += (v * v) |
| 158 | } |
| 159 | |
| 160 | return rv.toOtto() |
| 161 | } |