function add3( x, y, z ) {
	return x + y + z;
}
Computes the sum of three double-precision floating-point numbers.

@param {number} x - first input value
@param {number} y - second input value
@param {number} z - third input value
@returns {number} sum

@example
var v = add3( -1.0, 5.0, 2.0 );
// returns 6.0

@example
var v = add3( 2.0, 5.0, 2.0 );
// returns 9.0

@example
var v = add3( 0.0, 5.0, 2.0 );
// returns 7.0

@example
var v = add3( -0.0, 0.0, -0.0 );
// returns 0.0

@example
var v = add3( NaN, NaN, NaN );
// returns NaN