Function powish

external/.d3.js:15391–15406

(transform)

}

function powish(transform) {
  var scale = transform(identity$3, identity$3),
      exponent = 1;

  function rescale() {
    return exponent === 1 ? transform(identity$3, identity$3)
        : exponent === 0.5 ? transform(transformSqrt, transformSquare)
        : transform(transformPow(exponent), transformPow(1 / exponent));
  }

  scale.exponent = function(_) {
    return arguments.length ? (exponent = +_, rescale()) : exponent;
  };

  return linearish(scale);
}

function pow() {
  var scale = powish(transformer$2());