Map

Noun · Development

Definitions

  1. Either (1) a key-value data structure (also called dictionary, hash map, or associative array) that provides near-constant-time lookup by key, or (2) a higher-order function that applies a transformation to every element of a collection, returning a new collection of results.

    In plain English: A data structure that pairs keys with values for fast lookup, or a function that transforms every item in a list the same way.

    Example: "We map over the user list to extract emails, then store the id-to-email map in Redis."

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