Data Transformations

Overview

map is a function that takes an array of items, and returns a new array, with each item replaced by something new. It does this by taking a function as argument. This argument function takes an item and returns a new item. Topics

• Single Record Maps - transforming each record in a dataset based on information in that record alone
• Aggregations - creates a single value out of a list of values. Examples include sums and averages.
• Adjacent Record Maps - transforming each record in a dataset based on information in that record and an adjacent record alone.
• Dataset Maps - transforms each record in the dataset using information from every record in the dataset.
• Running Total Maps - transforms each record based on the data in that record or data in any record prior to it in the dataset