library['_'] = function Operator_ (orca, x, y, passive) {
  Operator.call(this, orca, x, y, '_', passive)

  this.name = 'niff'
  this.info = 'Reads offset, if equal to char'

  this.ports.x = { x: -2, y: 0 }
  this.ports.y = { x: -1, y: 0 }
  this.ports.comparison = { x: 1, y: 0 }
  this.ports.output = { x: 0, y: 1, bang: true }

  this.operation = function (force = false) {
    const x = 0 - this.listen(this.ports.x, true)
    const y = 0 - (this.listen(this.ports.y, true) + 1)
    this.ports.val = {x, y }
    const a = this.listen(this.ports.comparison)
    const b = this.listen(this.ports.val)
    return a !== b
  }
}