Method select

external/.scrollLibs.js:15855–15866

(columnNames)

  }
  // todo: preserve subclasses!
  select(columnNames) {
    columnNames = Array.isArray(columnNames) ? columnNames : [columnNames]
    const result = new Particle()
    this.forEach(particle => {
      const newParticle = result.appendLine(particle.getLine())
      columnNames.forEach(name => {
        const valueParticle = particle.getParticle(name)
        if (valueParticle) newParticle.appendParticle(valueParticle)
      })
    })
    return result
  }
  selectionToString() {
    return this.getSelectedParticles()
      .map(particle => particle.toString())