# Overload by lambda parameter type
**URL:** https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456
**Category:** Language Design
**Created:** [September 4, 2017, 2:48pm UTC](https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456 "2017-09-04T14:48:31Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@jaikrish](https://discuss.kotlinlang.org/u/jaikrish)
#### Post date: [September 4, 2017, 2:48pm UTC](https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456/1 "2017-09-04T14:48:31Z")
Since [overloading by lambda parameter count](https://discuss.kotlinlang.org/t/overload-ambiguity-lambda-parametercount/3916) is allowed, I would like to know why overloading by its **parameter type** is not possible?
```
fun get(path: String, completionHandler: (response: JSONArray) -> Unit)
fun get(path: String, completionHandler: (response: JSONObject, type: String) -> Unit) // Allowed
fun get(path: String, completionHandler: (response: JSONObject) -> Unit) // Error
```
---
### Author:  [@madmax1028](https://discuss.kotlinlang.org/u/madmax1028)
#### Post date: [September 4, 2017, 3:06pm UTC](https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456/2 "2017-09-04T15:06:15Z")
Because of Java generics erasure. It is a known problem and there is also a solution for such cases:
```auto
@JvmName("handleInts")
fun handle(list: List) {
println("handleInts")
}
@JvmName("handleStrings")
fun handle(list: List) {
println("handleStrings")
}
fun main(args: Array) {
handle(listOf(1, 2, 3)) // prints: handleInts
handle(listOf("1", "2", "3")) // prints: handleStrings
}
```
In your case you would do this:
```auto
@JvmName("getJSONArray")
fun get(path: String, completionHandler: (response: JSONArray) -> Unit)
fun get(path: String, completionHandler: (response: JSONObject, type: String) -> Unit) // this one is OK, because it is a diffrent functional type
@JvmName("getJSONObject")
fun get(path: String, completionHandler: (response: JSONObject) -> Unit)
```
---
### Author:  [@jaikrish](https://discuss.kotlinlang.org/u/jaikrish)
#### Post date: [September 5, 2017, 7:21am UTC](https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456/3 "2017-09-05T07:21:57Z")
Thank you! It works for the function definition but `@JvmName` annotation is not allowed in the interface it seems.
---
### Author:  [@madmax1028](https://discuss.kotlinlang.org/u/madmax1028)
#### Post date: [September 5, 2017, 10:49am UTC](https://discuss.kotlinlang.org/t/overload-by-lambda-parameter-type/4456/4 "2017-09-05T10:49:09Z")
Unfortunately it seems so:
```auto
@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.FILE)
@Retention(AnnotationRetention.BINARY)
@MustBeDocumented
public annotation class JvmName(val name: String)
```