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# Expandable Collection User Defined Function
### Usage
#### Data substitution
```go
aMap := data.NewMap();
aMap.Put("ts", "2015-02-11")
udf.Register(aMap)
expanded := aMap.ExpandAsText(`$FormatTime($ts, "yyyy")`)
```
#### Data node selection
```go
holder := data.NewMap()
collection := data.NewCollection()
collection.Push(map[string]interface{}{
"amount": 2,
"id":2,
"name":"p1",
"vendor":"v1",
})
collection.Push(map[string]interface{}{
"amount": 12,
"id":3,
"name":"p2",
"vendor":"v2",
})
holder.SetValue("node1.obj", collection)
records, err := Select([]interface{}{"node1/obj/*", "id", "name:product"}, holder)
```
#### The list of defined UDFs
- Length, Len returns length of slice, map or string
- AsMap - convert source into a map, it accepts data structure, or JSON, YAML literal
- AsCollection - convert source into a slice, it accepts data structure, or JSON, YAML literal
- AsData - convert source into a map or slice, it accepts data structure, or JSON, YAML literal
- AsInt - convert source into a an int
- AsFloat - convert source into a a float
- AsBool - convert source into a boolean
- AsNumber - converts to either int or float
- FormatTime, takes two arguments, date or now, followed by java style date format
- Values - returns map values
- Keys - return map keys
- IndexOf - returns index of matched slice element
- Join - join slice element with supplied separator
- Split - split text by separator
- Sum - sums values for matched Path, i.e. $Sum('node1/obj/*/amount')
- Count - counts values for matched Path, i.e. $Sum('node1/obj/*/amount')
- Select - selects attribute for matched path, i.e $Select("node1/obj/*", "id", "name:product")
- QueryEscape - url escape
- QueryUnescape - url unescape
- Base64Encode
- Base64DecodeText
- TrimSpace
- Elapsed elapsed time
- Rand
- Replace
- ToLower
- ToUpper
- AsNewLineDelimitedJSON
|
