cyclejs/cycle-core

# Isolate - [source](https://github.com/cyclejs/cyclejs/tree/master/isolate)

A utility function to make scoped dataflow components in Cycle.js.

```
npm install @cycle/isolate
```

See the Cycle.js [documentation on components](http://cycle.js.org/components.html#multiple-instances-of-the-same-component) for further details.

## Example

```js
import isolate from '@cycle/isolate';
import LabeledSlider from './LabeledSlider';

function bmiCalculator({DOM}) {
  let weightProps$ = Rx.Observable.just({
    label: 'Weight', unit: 'kg', min: 40, initial: 70, max: 140
  });
  let heightProps$ = Rx.Observable.just({
    label: 'Height', unit: 'cm', min: 140, initial: 170, max: 210
  });

  // LabeledSlider is a dataflow component
  // isolate(LabeledSlider) is an impure function: it generates
  // a NEW dataflow component every time it is called.
  let WeightSlider = isolate(LabeledSlider);
  let HeightSlider = isolate(LabeledSlider);

  let weightSlider = WeightSlider({DOM, props$: weightProps$});
  let heightSlider = HeightSlider({DOM, props$: heightProps$});

  let bmi$ = Rx.Observable.combineLatest(
    weightSlider.value$,
    heightSlider.value$,
    (weight, height) => {
      let heightMeters = height * 0.01;
      let bmi = Math.round(weight / (heightMeters * heightMeters));
      return bmi;
    }
  );

  return {
    DOM: bmi$.combineLatest(weightSlider.DOM, heightSlider.DOM,
      (bmi, weightVTree, heightVTree) =>
        h('div', [
          weightVTree,
          heightVTree,
          h('h2', 'BMI is ' + bmi)
        ])
      )
  };
}
```

# API