How to resolve the algorithm Filter step by step in the EchoLisp programming language

Published on 12 May 2024 09:40 PM
#Echolisp

How to resolve the algorithm Filter step by step in the EchoLisp programming language

Table of Contents

Problem Statement

Select certain elements from an Array into a new Array in a generic way.

To demonstrate, select all even numbers from an Array. As an option, give a second solution which filters destructively, by modifying the original Array rather than creating a new Array.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Filter step by step in the EchoLisp programming language

Source code in the echolisp programming language

(iota 12) → { 0 1 2 3 4 5 6 7 8 9 10 11 }

;; lists
(filter even? (iota 12))
    → (0 2 4 6 8 10)

;; array (non destructive)
(vector-filter even? #(1 2 3 4 5 6 7 8 9 10 11 12 13))
    → #( 2 4 6 8 10 12)

;; sequence, infinite, lazy
(lib 'sequences)
(define evens (filter even? [0 ..]))

(take evens 12)
    → (0 2 4 6 8 10 12 14 16 18 20 22)

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