function

max

Source

/**
  * Returns the larger of two numbers.
  *
  * Returns NaN if either argument is NaN.
  * The larger of [:-0.0:] and [:0.0:] is [:0.0:]. If the arguments are
  * otherwise equal (including int and doubles with the same mathematical value)
  * then it is unspecified which of the two arguments is returned.
  */
num max(num a, num b) {
  // These partially redundant type checks improve code quality for dart2js.
  // Most of the improvement is at call sites from the inferred non-null num
  // return type.
  if (a is! num) throw new ArgumentError(a);
  if (b is! num) throw new ArgumentError(b);

  if (a > b) return a;
  if (a < b) return b;
  if (b is double) {
    // Special case for NaN and -0.0. If one argument is NaN return NaN.
    // [max] must also distinguish between -0.0 and 0.0.
    if (a is double) {
      if (a == 0.0) {
        // a is either 0.0 or -0.0. b is either 0.0, -0.0, or NaN.
        // The following returns 0.0 if either a or b is 0.0, and it
        // returns NaN if b is NaN.
        return a + b;
      }
    }
    // Check for NaN.
    if (b.isNaN) return b;
    return a;
  }
  // max(-0.0, 0) must return 0.
  if (b == 0 && a.isNegative) return b;
  return a;
}