Bitovi

can.onKeyValue

Used by can-reflect.onKeyValue to listen to when the underlying stream emits either a value or error with a new value.

`stream[@@can.onKeyValue](key, handler)`

can-reflect.onKeyValue will use this function to listen to when emitted values or errors change.

Notice how the following only logs 3 numbers even though 4 numbers are emitted:

import Kefir from "can-kefir";

const count = Kefir.sequentially( 1000, [ 1, 2, 2, 3 ] );

canReflect.onKeyValue( stream, "value", function( newVal ) {
    console.log( "new value", newVal );
} ); // logs 1, 2, 3

Parameters

key {String}:
Either value for values emitted by the stream or error or error values emitted by the stream.
handler {function(value)}:
A function handler that will be called when the emitted value changes with the emitted value.