nullne / evaluator Goto Github PK

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func (f SuccessiveBinaryOperator) Eval(params ...interface{}) (interface{}, error) {
if l := len(params); l < 2 {
return 0.0, fmt.Errorf("SuccessiveBinaryOperator: need at leat two params, but got %d", l)
}
var res float64
for _, p := range params {
v, err := toFloat64(p)
if err != nil {
return 0.0, fmt.Errorf("SuccessiveBinaryOperator: %+v", err)
}
switch f.Mode {
case ModeAdd:
res += v
case ModeMultiply:
res *= v
default:
return 0.0, errors.New("SuccessiveBinaryOperator: only support add and multiply")
}
}
return res, nil
}

如果是乘法时 res默认为0 无论乘什么都是0 需要在for循环前添加
if f.Mode==ModeMultiply{
res=1
}