loop-grid/lib/computed-next-tick.js

An observable collection of looped event sequences shaped to a grid.

var Observ = require('observ')
var setImmediate = require('setimmediate2').setImmediate

module.exports = computed

function computed (observables, lambda) {
  var values = observables.map(function (o) {
    return o()
  })

  var result = Observ(lambda.apply(null, values))
  var pending = false

  observables.forEach(function (o, index) {
    o(function (newValue) {
      values[index] = newValue
      if (!pending) {
        pending = true
        setImmediate(result.refresh)
      }
    })
  })

  result.refresh = function () {
    if (pending) {
      pending = false
      result.set(lambda.apply(null, values))
    }
  }

  return result
}