low: stoppable in view

[betula]

const v = value(0);
const positive_v = v.view((n) => n >= 0 ? n : stoppable().stop()); // Add stop method to stop signal. (Make external stop siglal interface)

on(positive_v, console.log) // only positive reactions
// but inside value can be any values, and negative too.

// Task: make a positive stream, ignore negative values.

const v = value(0);
const b = value(0);
sync(v, (val) => val >= 0 && b(val));

// what is the method (shortcut) for making it

v.view((dest, val) => val >= 0 && dest(val));

// This is the perfect view.

// or

v.view((val) => val < 0 && stoppable.stop());

// No have reasons for making stoppable in view. Because it will stop only subscribers reaction, but what to be received for direct reading? (undefined)

// That method provide a new entity with the same set of methods.

// But Its only view. Its parts of one entity. Its not a one task.

v.flow((dest, val, prev?) => val >= 0 && dest(val)); // That case is new one.

// That necessary for creating a new entity (signal, value, ready, etc...), from another entity

[betula]

Closed with making new task: #41