dIdx

dIdx is a variable name used in several programming contexts. There is no single formal definition for dIdx; its meaning is determined by the context of the codebase, library, or algorithm in which it appears.

Most commonly, dIdx is short for one of several concepts. It can denote a delta index, representing the difference between two indices in an algorithm that tracks changes or shifts in position. It can also indicate a dynamic index, an index whose value updates as data streams in or as a computation progresses. In data movement or transformation routines, dIdx may signify a destination index—the position in an output buffer where the current item should be written. In graph or distance-based algorithms, it can stand for a distance index, indexing vertices by a computed distance category. The actual interpretation depends on the surrounding code and comments.

Because of its ambiguity, it is advisable to consult the relevant source files or documentation when encountering dIdx. In well-documented codebases, the variable will be defined with a comment or alongside a data structure that clarifies its purpose. In teams or projects that value readability, more descriptive names such as deltaIndex, dynamicIndex, or destIndex are preferred.

See also: index, delta, dynamic, destination index, distance index.