JavaScript needs more helper functions for iteration (map, filter, etc.) – where should we put them?

Iteration is a standard that connects operations with data containers: Each operation that follows this standard, can be applied to each data container that implements this standard.
In this blog post:

We first explore three questions:

How does JavaS…


This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer

Iteration is a standard that connects operations with data containers: Each operation that follows this standard, can be applied to each data container that implements this standard.

In this blog post:

  • We first explore three questions:
    • How does JavaScript’s iteration work?
    • What are its quirks?
    • What do helper functions for iteration look like? Examples include iteration versions of the Array methods .map(), .filter(), and .forEach().
  • Next, we examine the pros and cons of several approaches for implementing helper functions: As methods of data containers? As functions? Etc. Two of these approaches are supported by concrete proposals.
  • The post concludes by explaining additional benefits of iteration and iteration-based helpers.
[Read rest of post]


This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer


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