function distance$1(a, b) {
    var x = b[0] - a[0];
    var y = b[1] - a[1];
    var z = b[2] - a[2];
    var w = b[3] - a[3];
    return Math.hypot(x, y, z, w);
  }
Calculates the euclidian distance between two vec4's

@param {ReadonlyVec4} a the first operand
@param {ReadonlyVec4} b the second operand
@returns {Number} distance between a and b