Got a little miffed by the fact that str.toInt threw an exception if a non-convertible string was encountered (a-la "hello".toInt), so I figured it would make more sense if it returned an option instead, using this library you can do this: "hello".opt.toInt which would return None, saving you a tedious try/catch

SafeConvert.scala

package com.wausoft.extensions

object SafeString {
  class StrOps(input: String) {
    private def toOption[A](in: => A) = try {
      Some(in)
    } catch {
      case _: Throwable => None
    }

    def toInt: Option[Int] = toOption(input.toInt)
    def toFloat: Option[Float] = toOption(input.toFloat)
    def toDouble: Option[Double] = toOption(input.toDouble)
    def toLong: Option[Long] = toOption(input.toLong)
  }

  implicit class RichString(val left: String) extends AnyVal {
    def opt: StrOps = new StrOps(left)
  }
}