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:

var Kefir = require("can-kefir");

var 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.