subtract = (out, a, b) => {
  out[0] = a[0] - b[0]
  out[1] = a[1] - b[1]
  return out
}
Subtracts the coordinates of two vectors (A-B).

@param {vec2} out - receiving vector
@param {vec2} a - first operand
@param {vec2} b - second operand
@returns {vec2} out
@alias module:modeling/maths/vec2.subtract