Method limit

external/.scrollLibs.js:15926–15934

(quantity, offset = 0)

  }
  // todo: preserve subclasses!
  limit(quantity, offset = 0) {
    const result = new Particle()
    this.getSubparticles()
      .slice(offset, quantity + offset)
      .forEach(particle => {
        result.appendParticle(particle)
      })
    return result
  }
  getSubparticlesFirstArray() {
    const arr = []
    this._getSubparticlesFirstArray(arr)