Storing a value inside a collection at a given key or index and then unconditionally overwriting it without reading the initial value is a case of
a "dead store".
letters.put("a", "Apple");
letters.put("a", "Boy"); // Noncompliant
towns[i] = "London";
towns[i] = "Chicago"; // Noncompliant
This practice is redundant and will cause confusion for the reader. More importantly, it is often an error and not what the developer intended to
do.
