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["a"] = "Apple"
letters["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.
