A pure function is a specific kind of value-producing function that not only has no side effects but also doesn’t rely on side effects from other code—for example, it doesn’t read global variables that are occasionally changed by other code. A pure function has the pleasant property that, when called with the same arguments, it always produces the same value (and doesn’t do anything else). This makes it easy to reason about. A call to such a function can be mentally substituted by its result, without changing the meaning of the code. When you are not sure that a pure function is working correctly, you can test it by simply calling it, and know that if it works in that context, it will work in any context. Nonpure functions might return different values based on all kinds of factors and have side effects that might be hard to test and think about.
Use of QVAR with a spacer device in children less than 5 years of age is not recommended. In vitro dose characterization studies were performed with QVAR 40 mcg/actuation with the OptiChamber and AeroChamber Plus ® spacer utilizing inspiratory flows representative of children under 5 years old. These studies indicated that the amount of medication delivered through the spacing device decreased rapidly with increasing wait times of 5 to 10 seconds as shown in Table 2. If QVAR is used with a spacer device, it is important to inhale immediately.
Emily Taylor, despite being reunited with her husband from prison, becomes severely depressed with emotional episodes and suicide attempts. Her psychiatrist, Jonathan Banks, after conferring with her previous doctor, eventually prescribes an experimental new medication called Ablixa. The plot thickens when the side effects of the drug lead to Emily killing her husband in a "sleepwalking" state. With Emily plea-bargained into mental hospital confinement and Dr. Banks' practice crumbling around him, the case seems closed. However, Dr. Banks cannot accept full responsibility and investigates to clear his name. What follows is a dark quest that threatens to tear what's left of his life apart even as he discovers the diabolical truth of this tragedy. Written by Kenneth Chisholm (kchishol@)